Final answer:
Covert monitoring is the practice where a reviewer listens to live calls without the analyst's knowledge, often used for quality control or security.
Step-by-step explanation:
When a reviewer listens to live calls without the analyst’s knowledge, this type of call monitoring is known as Covert monitoring. Covert monitoring refers to the practice of observing or reviewing employees’ work performance without their awareness, which is often used in quality control or security contexts.
This type of monitoring is different from recorded or real-time monitoring, where the analyst is aware that their calls may be monitored or evaluated for feedback purposes.