The relative security of a commercial cryptographic system can be measured by the?

A.
Rating value assigned by the government agencies that use the system.

B.
Minimum number of cryptographic iterations required by the system.

C.
Size of the key space and the available computational power.

D.
Key change methodology used by the cryptographic system.

Explanation:
The strength of the encryption method comes from the algorithm, secrecy of the key, length of the
key, initialization vectors, and how they all work together. – Shon Harris All-inone CISSP Certification
Guide pg 504