T1B02

Which of the following U.S. amateur radio operators are allowed to contact the International Space Station (ISS) on VHF bands?

1. AOnly amateurs with a General class or higher license
2. BAny amateur with a Technician class or higher license
3. COnly amateurs with a General class or higher license, and NASA approval
4. DAny amateurs with a Technician class or higher license, and NASA approval

Pick an answer to check it.