Final answer:
The correct term for a system that recognizes key words or phrases from a caller is a Speech recognition system.
Step-by-step explanation:
The term that refers to a system recognizing key words or phrases spoken by a caller is b) Speech recognition system. This technology uses algorithms to analyze spoken language and convert it into text that the system can understand.
It is widely used in many applications, such as virtual assistants, transcription services, and customer service operations to facilitate interaction with computers using natural language speech.