The residual risk is 25% in this scenario. Residual risk is the portion of risk that remains after security measures have been applied to mitigate the risk. Residual risk can be calculated by subtracting the risk reduction from the total risk. In this scenario, the total risk is 100%, and the risk reduction is 75%. The risk reduction is 75% because the control stops 50% of attacks, and reduces the impact of an attack by 50%. Therefore, the residual risk is 100% - 75% = 25%.
Alternatively, the residual risk can be calculated by multiplying the probability and the impact of the remaining risk. In this scenario, the probability of an attack is 50%, and the impact of an attack is 50%. Therefore, the residual risk is 50% x 50% = 25%. 50%, 75%, and 100% are not the correct answers to the question, as they do not reflect the correct calculation of the residual risk.

Customer identifiers that do not resemble the user's government-issued ID number should be used is the recommendation that should be made to the product development team. A customer identifier is a unique value that is assigned to a customer to identify and distinguish the customer from other customers, and to enable the customer to access the products or services of an organization, such as a username, a password, a token, or a biometric. A government-issued ID number is a unique value that is assigned to a person by a government authority to identify and verify the person's identity, and to enable the person to access the government services or benefits, such as a social security number, a passport number, or a driver's license number. Customer identifiers that do not resemble the user's government-issued ID number should be used is the recommendation that should be made to the product development team, because it can provide the following benefits:
* It can protect the privacy and security of the customers, and prevent or mitigate the risks of identity theft, fraud, or misuse of the government-issued ID numbers, which are sensitive and personal information that can reveal the customers' identity, location, or status.
* It can comply with the legal and regulatory requirements and standards that apply to the collection, use, and protection of the government-issued ID numbers, and avoid or minimize the liabilities or penalties that may arise from the non-compliance or violation of the requirements or standards.
* It can reduce the complexity and cost of the product development and maintenance, and avoid the dependency or reliance on the government authorities or systems that issue or validate the government-issued ID numbers, which may have different formats, rules, or procedures. The other options are not the recommendations that should be made to the product development team, as they either do not protect the privacy and security of the customers, do not comply with the legal and regulatory requirements and standards, or do not reduce the complexity and cost of the product development and maintenance. References: CISSP - Certified Information Systems Security Professional, Domain 5. Identity and Access Management (IAM), 5.1 Control physical and logical access to assets, 5.1.1 Manage identification and authentication of people, devices, and services, 5.1.1.1 Identity management implementation; CISSP Exam Outline, Domain 5. Identity and Access Management (IAM),

HIPAA was designed to provide for greater access to personal
health care information, enable portability of health care insurance,
establish strong penalties for health care fraud, and streamline the
health care claims process through administrative simplification. To
accomplish the latter, Title II of the HIPAA law, Administrative Simplification, requires standardizing the formats for the electronic transmission of health care information. The transactions and code sets portion includes standards for submitting claims, enrollment information, premium payments, and others as adopted by HHS. The standard for transactions is the ANSI ASC X12N version 4010 EDI
Standard. Standard code sets are required for diagnoses and inpatient
services, professional services, dental services (replaces D'
codes), and drugs (instead of J' codes). Also, local codes are not to be used. Unique health identifiers are required to identify health care providers, health plans, employers, and individuals. Security and electronic signatures are specified to protect health care information. Pri- vacy protections are required to ensure that there is no unauthorized
disclosure of individually identifiable health care information.
The other answers are incorrect since they do not include all four
major standards. Additional information can be found at http://
aspe.hhs.gov/adminsimp.