CRR stands for which of the following phrases?

• A. Command Response Relay
• B. Control Response Release
• C. Coordinate Response Request
• D. Command Response Release

Answer: (D)

Acronyms are built from the initial letters of each word, so CRR signals a three-word phrase starting with C, then R, then R. In this material, the standard expansion is Command Response Release. That fits the initials perfectly and aligns with the domain’s usage: a command is issued, a response acknowledges or follows it, and a release signifies the formal authorization or completion of that command. The other options differ in the last word or the first word, which in this context would not match the established terminology. Relay would imply passing along information rather than finalizing an action, and Coordinate uses a different first word altogether. So Command Response Release is the best fit.