Question: What happens to the MAC entity when a UE performs cell-reselection?
Option 1: The MAC entity is modified.
Option 2: The MAC entity is released.
Option 3: The MAC entity is reset.
Option 4: The MAC entity remains unchanged.
Explanation: According to the multicast MRB configuration procedure, when a UE performs cell-reselection, it resets the MAC entity. This ensures that the MAC layer is reinitialized and synchronized with the new cell's parameters.