Computer performance is the measure of how well a computer system can execute tasks and applications within a given time frame. Computer performance can be affected by various factors, such as hardware specifications, software configuration, network conditions, and user behavior. To analyze computer performance, it is important to use statistical metrics that can quantify the capacity utilization of the system resources, such as CPU, memory, disk, and network. These metrics can help identify the bottlenecks, inefficiencies, and anomalies that may degrade the performance of the system. Examples of such metrics include CPU utilization, memory usage, disk throughput, network bandwidth, and response time.
The other options are not as useful as statistical metrics when analyzing computer performance. An operations report of user dissatisfaction with response time is a subjective measure that may not reflect the actual performance of the system. Tuning of system software to optimize resource usage is a corrective action that can improve performance, but it is not a method of analysis. A report of off-peak utilization and response time is a limited snapshot that may not capture the peak performance or the average performance of the system.
References:
* What is Computer Performance?
* How to Measure Computer Performance

Explanation/Reference:
Explanation:
All of the above are features of a digital signature. Non repudiation ensures that the claimed sender cannot later deny generating and sending the message. Data integrity refers to changes in the plaintext message that would result in the recipient failing to compute the same message hash. Since only the claimed sender has the key, authentication ensures that the message has been sent by the claimed sender.
Replay protection is a method that a recipient can use to check that the message was not intercepted and replayed.

Section: Protection of Information Assets
Explanation:
Functional acknowledgements are standard EDI transactions that tell trading partners that their electronic
documents were received. Different types of functional acknowledgments provide various levels of detail
and, therefore, can act as an audit trail for EDI transactions. The other choices are not relevant to the
description of functional acknowledgements.

Substantive testing is the most important type of testing during software license audits, as it provides evidence of the accuracy and completeness of the software inventory and licensing records. Substantive testing involves examining transactions, balances, and other data to verify their validity, existence, accuracy, and valuation.
Compliance testing, on the other hand, is more focused on assessing the adequacy and effectiveness of internal controls over software licensing, such as policies, procedures, and monitoring mechanisms. Compliance testing alone cannot provide sufficient assurance that the software license audit objectives are met, as it does not verify the actual software usage and compliance status. Judgmental sampling and stop-or-go sampling are methods of selecting samples for testing, not types of testing themselves. *References: According to the ISACA IT Audit and Assurance Standards, Guidelines and Tools and Techniques for IS Audit and Assurance Professionals, section 1206 Testing, "The IS audit and assurance professional should perform sufficient testing to obtain sufficient appropriate evidence to support conclusions reached." 1 The section also defines substantive testing as "testing performed to obtain audit evidence to detect material misstatements in transactions or balances" and compliance testing as "testing performed to obtain audit evidence on the operating effectiveness of controls." 1 According to the ISACA IT Audit and Assurance Guideline G15 Software License Management, "The objective of a software license audit is to provide management with an independent assessment relating to compliance with software license agreements." 2 The guideline also states that "substantive tests should be performed on a sample basis to verify that all software installed on devices within scope has been appropriately licensed." 2