Which of the following documents can be best aid in selecting controls to be monitored? Response:

NIST SP 800-37 is the "Guide for Applying the Risk Management Framework," which outlines the overall process but does not specifically detail the selection of controls for monitoring based on categorization.

FISMA (Federal Information Security Modernization Act) is a law that mandates security, but it does not provide specific guidance on selecting controls for monitoring.

FIPS 199, "Standards for Security Categorization of Federal Information and Information Systems," defines how to categorize information and systems based on potential impact (low, moderate, high) to confidentiality, integrity, and availability. This categorization is a fundamental input for selecting the appropriate security controls, which are then subject to monitoring to ensure effectiveness.

NIST SP 800-18 is the "Guide for Developing Security Plans for Federal Information Systems," focusing on creating security plans rather than the initial selection of controls for monitoring based on categorization.