What type of communication message can a handshake convey?

Correct answer: Non-verbal communication

The governing concept is that communication can occur through gestures and physical actions without spoken or written words. A handshake may convey greeting, respect, welcome, friendship, or agreement through touch and social convention. Thus, option A is correct because it is non-verbal communication. Written communication requires text, digital communication requires an electronic channel, and radio communication uses transmitted sound, so the other options do not describe the handshake itself.