E1F06

Under what circumstances might the FCC issue a Special Temporary Authority (STA) to an amateur station?

1. ATo provide for experimental amateur communications
2. BTo allow use of a special event call sign
3. CTo allow a VE group with less than three VEs to administer examinations in a remote, sparsely populated area
4. DTo allow a licensee who has passed an upgrade exam to operate with upgraded privileges while waiting for posting on the FCC database

Pick an answer to check it.