Question: Which reference points are utilized by the LM-S reference point for subscription/notification related signaling in the context of location management functions between the VAL server and the location management server?
Option 1: Only HTTP-1 and HTTP-2
Option 2: SIP-1 and SIP-2
Option 3: CAPIF-2 exclusively
Option 4: A combination of SIP-1, SIP-2, HTTP-1, and HTTP-2
Explanation: The correct answer is Option 2 because, according to the specifications, for subscription/notification related signaling, the LM-S reference point specifically uses SIP-1 and SIP-2 reference points. This highlights the role of SIP (Session Initiation Protocol) in managing subscriptions and notifications within telecom networks, particularly in the context of location management services.