A security analyst is attempting to break into a client`s secure network. The analyst was not given prior information about the client, except for a block of public IP addresses that are currently in use. After network enumeration, the analyst`s NEXT step is to perform: 

Answer options:

A. a gray-box penetration test
B. a risk analysis
C. a vulnerability assessment
D. an external security audit
E. a red team exercise

A