Question: Upon receiving a `measIdToRemoveList` from the network, what actions does a User Equipment (UE) take for each `measId` included in the list that matches an entry in its current `VarMeasConfig`?
Option 1: Only remove the matching `measId` entry from `measIdList` within `VarMeasConfig`.
Option 2: Stop all ongoing measurements and reset `VarMeasConfig` to default settings.
Option 3: Remove the `measId` from `measIdList`, remove its measurement reporting entry (if present), stop & reset the associated timer (periodical reporting or T321).
Option 4: Ignore the `measId` if it's not part of the current `VarMeasConfig` and continue with existing measurements.
Explanation: This option correctly outlines the comprehensive set of actions a UE must take upon receiving a `measIdToRemoveList` for a `measId` that is currently configured. These actions ensure the UE's measurement configuration is updated, any associated reporting is ceased, and relevant timers are managed to prevent further unnecessary measurements, aligning with efficient resource management and adherence to network instructions in a wireless communication system.