Why is Jim having these problems?

Jim was having no luck performing a penetration test on his company’s network. He was running the test from home and had downloaded every security scanner he could lay his hands on. Despite knowing the IP range of all of the systems, and the exact network configuration, Jim was unable to get any useful results. Why is Jim having these problems?

A.
Security scanners are not designed to do testing through a firewall

B.
Security scanners cannot perform vulnerability linkage

C.
Security scanners are only as smart as their database and cannot find unpublished vulnerabilities

D.
All of the above

Explanation:
The Security scanners available online are often to “outdated” to perform a live pentest against a victim.