The correct answer is:
(a) True
Explanation: In the context of cognitive radio and cognitive systems, learning is indeed a function of perception. Perception refers to the ability of a system (or agent) to sense or gather information from the environment. Learning, on the other hand, involves the processing and analysis of this information to adapt and improve the system's behavior or decision-making capabilities.
In cognitive radio, this process can involve sensing the radio environment (e.g., detecting spectrum availability) and learning from that information to optimize communication, avoid interference, or improve spectrum usage.
Thus, learning in cognitive systems like cognitive radio is typically based on the perception (sensing and gathering information) of the environment.