Question: When does a UE apply the new multicast MCCH information after receiving a change notification in RRC_INACTIVE state?
Option 1: Immediately after receiving the change notification
Option 2: Starting from the same slot when it receives the change notification
Option 3: After a random access procedure is completed
Option 4: Only after the current modification period ends
Explanation: According to the multicast MCCH information validity and notification of changes, upon receiving a change notification, a UE applies the previously acquired multicast MCCH information until it acquires the new multicast MCCH information starting from the same slot.