If receiving transponder code 7500, ATC should:

Treat it as unlawful interference and follow hijack procedures without questioning the crew extensively

Correct

Ignore it as a false alarm

Ask the pilot to confirm the code

Request the pilot to squawk 7700 instead

Explanation

ATC should treat 7500 as a genuine hijacking, following security protocols, and avoid extensive questioning that might compromise crew safety.

Test yourself with random questions from Operational Procedures and all other ATPL subjects.