Natalie Brooks is leading an authorized red team exercise for Sentinel Networks in Seattle.

The correct answer is B. Green Hat Hacker.

A Green Hat Hacker is a beginner or newcomer who is learning hacking techniques and building practical skills. The profile in the scenario describes someone new to cybersecurity, actively learning from online communities, and experimenting with basic tools.

CEH-aligned hacker classification material describes a Neophyte, also called a n00b, newbie, or Green Hat Hacker, as someone who is new to hacking or phreaking and has little or no knowledge or experience with technology and hacking .

Option A. Blue Hat Hacker is incorrect because a blue hat hacker is commonly associated with external bug testing before a system launch.

Option C. Gray Hat Hacker is incorrect because gray hats may violate rules or permissions while not necessarily having malicious intent.

Option D. Red Hat Hacker is incorrect because red hats are generally associated with aggressive action against malicious hackers or high-value targets.

Therefore, the best answer is B. Green Hat Hacker.