Creating a secondary authentication process for network access would be an example of?

 Layered Security Approach: Secondary authentication adds another layer of security, contributing to the Defense in Depth strategy. Enumerating costs ensures the layered approach is cost-effective and aligns with organizational budgets.  Why This is Correct: Secondary authentication strengthens access controls, a critical aspect of Defense in Depth.  Why Other Options Are Incorrect:
A . Nonlinearities in metrics: Irrelevant to authentication processes.
C . System hardening: Focuses on system configurations, not authentication.
D . Anti-virus for mobile devices: Unrelated to authentication processes.  Reference: EC-Council highlights Defense in Depth strategies as essential for layered protection mechanisms like secondary authentication.