Final answer:
The requirement for a club station license grant is that the club's trustee must be a licensed amateur, as per FCC regulations.
Step-by-step explanation:
In terms of the requirements for the issuance of a club station license grant, out of the options provided, Option 3: The trustee must be a licensed amateur, is the correct requirement. While the number of members or having a unique call sign might contribute to the identity of the club, they are not a mandatory requirement. FCC regulations stipulate that there must be a designated license holder, or 'trustee', who is a licensed amateur, for the club station. This individual is responsible for the operation of the club station in accordance to FCC regulations.
Learn more about Club Station License Requirements