Your U.S. tankship is designed to carry anhydrous ammonia in bulk. The keel was laid in 1980. Which statement concerning the carriage of this cargo is TRUE?

A
A flammable gas detection system must be installed in each cargo pump room.
B
The cargo may be gauged by automatic float type devices.
C
Carriage of this cargo is authorized by issuance of an IMO Certificate.
D
Aluminum, copper, zinc, and mercury are allowed in valve parts in contact with the cargo.
E