Question: What is the primary purpose of the Nbsf_Management_Unsubscribe service operation in the 5G System (5GS)?
Option 1: To establish a new subscription for a UE.
Option 2: To modify an existing subscription for a UE.
Option 3: To undo a previous subscription for a UE.
Option 4: To retrieve information about existing subscriptions.
Explanation: The Nbsf_Management_Unsubscribe service operation allows the NEF, AF, TSCTSF, or PCF for a UE to cancel a previously established subscription. This is evident from the description of the service operation, which states that it can "undo a previous subscription".