What marking must be on the raft container that carries an EPIRB?

The marking on the raft container that carries an Emergency Position Indicating Radio Beacon (EPIRB) must indicate the last date of test and battery expiration. This requirement is essential because EPIRBs are critical safety devices designed for emergency situations, and their effectiveness is directly linked to the condition of the battery and the results of any testing performed.

By including the last test date, personnel can ascertain whether the EPIRB has been maintained correctly and can be relied upon in an emergency. The battery expiration date is equally important, as a depleted battery renders the EPIRB useless when it is most needed. Marking these dates helps ensure that the equipment is operational and ready for use.

The other options, while possibly relevant in different contexts, do not address the direct need for operational safety and maintenance verification that the testing and battery expiration dates provide.