Final answer:
Raul was eligible for the GREC owing to his broker's license and the gubernatorial appointment served as the formal procedural step for his membership.
Step-by-step explanation:
The criteria that made Raul eligible to be a broker member of the Georgia Real Estate Commission (GREC) include having a real estate license, which must specifically be a broker's license. Being appointed by the governor is an essential part of the process, but it is not a criterion that by itself makes one eligible for the commission. Thus, having a broker's license is the qualifying credential, while a gubernatorial appointment is the necessary procedural step for membership.