Explanation/Reference:
The failure of an electric utility company to supply power within acceptable range. Such a failure places a strain on electronic equipment and may limit their operational life or even cause permanent damage.
For CISA exam you should know below information about power failure
Total Failure (Blackout) - A complete loss of electric power, which may span from a single building to an entire geographical are and is often caused by weather conditions or inability of an electric utility company to meet user demands Severely reduced voltage (brownout) - The failure of an electric utility company to supply power within acceptable range. Such a failure places a strain on electronic equipment and may limit their operational life or even cause permanent damage.
Sags, spike and surge - Temporary and rapid decreases (sag) or increases (spike and surges) in a voltage levels. These anomalies can cause loss of data, data corruption, network transmission errors or physical damage to hardware devices.
Electromagnetic interference (EMI) - The electromagnetic interference (EMI) caused by electrical storms or noisy electrical equipments. The interference may cause computer system to hang or crash as well as damages similar to those caused by sags, spike and surges.
The following were incorrect answers:
Sag - Temporarily rapid decrease in a voltage.
Total Failure (Blackout) - A complete loss of electric power, which may span from a single building to an entire geographical are and is often caused by weather conditions or inability of an electric utility company to meet user demands Severely reduced voltage (brownout) - The failure of an electric utility company to supply power within acceptable range. Such a failure places a strain on electronic equipment and may limit their operational life or even cause permanent damage.
Following reference(s) were/was used to create this question:
CISA review manual 2014 Page number372

Section: Information System Operations, Maintenance and Support
Explanation:
The sum of RTO and WRT is defined as the Maximum Tolerable Downtime (MTD) which defines the total
amount of time that a business process can be disrupted without causing any unacceptable consequences.
This value should be defined by the business management team or someone like CTO, CIO or IT
manager.
For your exam you should know below information about RPO, RTO, WRT and MTD:
Stage 1: Business as usual
Business as usual

At this stage all systems are running production and working correctly.
Stage 2: Disaster occurs
Disaster Occurs

On a given point in time, disaster occurs and systems needs to be recovered. At this point the Recovery
Point Objective (RPO) determines the maximum acceptable amount of data loss measured in time. For
example, the maximum tolerable data loss is 15 minutes.
Stage 3: Recovery
Recovery

At this stage the system are recovered and back online but not ready for production yet. The Recovery
Time Objective (RTO) determines the maximum tolerable amount of time needed to bring all critical
systems back online. This covers, for example, restore data from back-up or fix of a failure. In most cases
this part is carried out by system administrator, network administrator, storage administrator etc.
Stage 4: Resume Production
Resume Production

At this stage all systems are recovered, integrity of the system or data is verified and all critical systems can
resume normal operations. The Work Recovery Time (WRT) determines the maximum tolerable amount of
time that is needed to verify the system and/or data integrity. This could be, for example, checking the
databases and logs, making sure the applications or services are running and are available. In most cases
those tasks are performed by application administrator, database administrator etc. When all systems
affected by the disaster are verified and/or recovered, the environment is ready to resume the production
again.
MTD

The sum of RTO and WRT is defined as the Maximum Tolerable Downtime (MTD) which defines the total
amount of time that a business process can be disrupted without causing any unacceptable consequences.
This value should be defined by the business management team or someone like CTO, CIO or IT
manager.
The following answers are incorrect:
RPO - Recovery Point Objective (RPO) determines the maximum acceptable amount of data loss
measured in time. For example, the maximum tolerable data loss is 15 minutes.
RTO - The Recovery Time Objective (RTO) determines the maximum tolerable amount of time needed to
bring all critical systems back online. This covers, for example, restore data from back-up or fix of a failure.
In most cases this part is carried out by system administrator, network administrator, storage administrator
etc.
WRT - The Work Recovery Time (WRT) determines the maximum tolerable amount of time that is needed
to verify the system and/or data integrity. This could be, for example, checking the databases and logs,
making sure the applications or services are running and are available. In most cases those tasks are
performed by application administrator, database administrator etc. When all systems affected by the
disaster are verified and/or recovered, the environment is ready to resume the production again.
References:
CISA review manual 2014 page number 284
http://defaultreasoning.com/2013/12/10/rpo-rto-wrt-mtdwth/

Encryption is the process of converting plain text into a coded format that cannot be easily understood by unauthorized parties. When applied to email messages, encryption helps to protect the confidentiality of the information being sent, by ensuring that only the intended recipient can access and read the contents of the message. This helps to prevent unauthorized access or interception of sensitive or confidential information that may be sent via email.
Reference:
ISACA. (2021). 2021 CISA Review Manual, 27th Edition. ISACA. (Chapter 3, Security Management Practices)

Section: Protection of Information Assets
Explanation

Explanation
The most conclusive audit procedure for evaluating the effectiveness of an e-commerce application system's edit routine is to use test transactions. A test transaction is a simulated input that is processed by the system to verify its output and performance1. By using test transactions, an auditor can directly observe how the edit routine checks the validity, accuracy, and completeness of data entered by users, and how it handles incorrect or invalid data. A test transaction can also help measure the efficiency, reliability, and security of the edit routine, as well as identify any errors or weaknesses in the system.
The other options are not as conclusive as using test transactions, as they rely on indirect or secondary sources of information. Reviewing program documentation is an audit procedure that involves examining the written description of the system's design, specifications, and functionality2. However, program documentation may not reflect the actual implementation or operation of the system, and it may not reveal any discrepancies or defects in the edit routine. Interviews with knowledgeable users is an audit procedure that involves asking questions to the people who use or manage the system3. However, interviews with knowledgeable users may not provide sufficient or objective evidence of the edit routine's effectiveness, and they may be influenced by personal opinions or biases. Reviewing source code is an audit procedure that involves analyzing the programming language and logic of the system4. However, reviewing source code may not be feasible or practical for complex or large systems, and it may not demonstrate how the edit routine performs in real scenarios.