An SLA requires performance monitoring of CPU, memory, storage, and networking. The number of users active on a system would not be part of an SLA specifically, other than in regard to the impact on the other four variables.

Explanation/Reference:
Explanation:
The physical security of crypto keys is of some concern, but guards or vaults are not always necessary.
Two-person integrity might be a good practice for protecting keys. The best answer to this question is option A, because it is always true, whereas the remaining options depend on circumstances.

Reproducibility is the measure of how easy it is to reproduce and successful use an exploit. Scoring within the DREAD model ranges from 0, signifying a nearly impossibly exploit, up to 10, which signifies something that anyone from a simple function call could exploit, such as a URL.

Explanation
DLP can be combined with DRM to protect intellectual property; both are designed to deal with data that falls into special categories. SIEMs are used for monitoring event logs, not live data movement. Kerberos is an authentication mechanism. Hypervisors are used for virtualization.