What prefix is used for call signs for assigned SAR aircraft?

The prefix used for call signs for assigned Search and Rescue (SAR) aircraft is "NC." This designation is standard within various air operations, allowing for clear identification and communication concerning SAR missions. The use of "NC" helps air traffic controllers, fellow pilots, and other stakeholders in the aviation community to quickly recognize that an aircraft is involved with search and rescue efforts, which is especially important in emergency situations where timely and efficient coordination is critical.

The other options do not relate to the specific call sign prefixes for SAR aircraft. For example, the ranges listed in the first option pertain to frequency bands used in radio communications rather than specific aircraft identifiers. "SECURATE" and "YYY" do not have established significance in the context of SAR operations or call signs, making "NC" the correct and recognized answer in this context. This understanding of prefixes aids in ensuring safety and clarity in air operations involving SAR missions.