If the terminal mode switch is turned off, which parameters are retained for no less than 48 hours?

The choice stating that initialization parameters and crypto variables are retained for no less than 48 hours when the terminal mode switch is turned off is correct because it reflects the design of secure communications systems like Link-16. Initialization parameters are crucial for establishing communication, as they set the necessary groundwork for how devices interact with one another in a joint operations environment.

Crypto variables, on the other hand, include essential cryptographic keys and algorithms that safeguard the integrity and confidentiality of the communications. These two elements must remain available for a defined period to facilitate a quick re-establishment of secure communication once the system is powered back on. This retention capability is vital for operational readiness, ensuring that systems can promptly resume critical activities without extensive reconfiguration or re-keying.

In contrast, other parameters listed in the other choices might not be specifically designed to persist in the same way or for the same duration when a system is powered down. For example, configuration settings and time references are typically system-specific and may not require the same level of retention under a powered-off state. Understanding this distinction is crucial for maintaining operational efficiency and security in joint multi-national operations.