Final answer:
Couriers may store classified material in a hotel safe equipped with an X-09 lock during overnight stops if it has been coordinated and approved by the activity security official; this is generally true and follows strict security protocols.
Step-by-step explanation:
Based on standard security protocols for handling classified materials, the statement that couriers may store classified material in a hotel safe with an X-09 electromechanical lock during overnight stops is generally true. However, it's important to highlight that such an action requires prior coordination and approval from the activity security official. The X-09 lock is a high-security lock that is approved for protecting classified material, and its use in this context is specified to ensure the security of such materials when they must be temporarily stored outside of a secure government facility. Nevertheless, the need for coordination and approval suggests that this action is not a standard practice but rather an exception made under specific circumstances, and subject to strict security protocols. It's crucial that these protocols be followed meticulously to maintain the integrity and security of the classified materials.