Question: What type of SCCP (Signaling Connection Control Part) services are utilized on the Gs interface between a Serving GPRS Support Node (SGSN) and a Visitors Location Register (VLR) in GSM Public Land Mobile Networks (PLMNs)?
Option 1: Connection-oriented Class 2 SCCP services
Option 2: Connectionless Class 0 SCCP services
Option 3: Both Connection-oriented Class 3 and Connectionless Class 0 SCCP services
Option 4: Only Connection-oriented Class 1 SCCP services
Explanation: The correct answer is Option 2 because, according to the specifications for the Gs interface in GSM PLMNs, only connectionless class 0 SCCP services are utilized. This simplification ensures efficient signaling between the SGSN and VLR without the overhead of connection-oriented services.