A security audit is best defined as what? $($D$3,$ L$8\mathrm{.}4)$

A covert series of tests designed to test network authentication, hosts and perimeter security

A technical assessment that measures how well an organization uses security policies and controls to protect its information assets

Employing an intrusion detection system $($IDS$)$ to monitor anomalous traffic on a network segment and logging attempted break$-$ins

Hardening systems before deploying them on the corporate network