Which of the following BEST represents a risk associated with merging two enterprises during an acquisition?

A Chief Information Security Officer (CISO is reviewing and revising system configuration and hardening guides that were developed internally and have been used several years to secure the organization's systems. The CISO knows improvements can be made to the guides.
Which of the following would be the BEST source of reference during the revision process?

A company's user community is being adversely affected by various types of emails whose authenticity cannot be trusted. The Chief Information Security Officer (CISO) must address the problem.
Which of the following solutions would BEST support trustworthy communication solutions?

A security analyst is trying to identify the source of a recent data loss incident. The analyst has reviewed all the for the time surrounding the identified all the assets on the network at the time of the data loss. The analyst suspects the key to finding the source was obfuscated in an application. Which of the following tools should the analyst use NEXT?

A technician is validating compliance with organizational policies. The user and machine accounts in the AD are not set to expire, which is non-compliant. Which of the following network tools would provide this type of information?