What two elements support only designated Navy requirements?

The correct answer highlights the specific networks that are tailored to meet designated Navy requirements. The High Command Communications Network (HICOM) is specifically designed to support high-level command communications for Navy operations, ensuring secure and reliable communication for command staff. Similarly, the Navy Operational Radio and Telephone Switchboard (NORATS) is utilized for providing efficient operational communication support within naval environments, further emphasizing its role in meeting unique Navy requirements.

These elements are distinguished by their focused purpose of addressing the operational facets needed by the Navy, making them integral for effective communication and command processes within naval operations. In contrast, the other options may incorporate broader communication networks that could overlap with functions outside exclusively Navy designations or offer general support rather than being solely dedicated to Navy requirements.