Question: Which of the following statements accurately describes the scope of the 'GTP.InDataPktGnGGSN' measurement on the Gn interface from GGSN to SGSN?
Option 1: It exclusively counts GTP Data PDUs for a specific GTP version (either v0 or v1) and is limited to circuit-switched domains.
Option 2: It provides a single, combined count of accepted GTP Data PDUs regardless of the GTP version used, applicable only to packet-switching domains.
Option 3: It measures outgoing GTP data packets from SGSN to GGSN and is relevant for both packet-switched and circuit-switched contexts.
Option 4: It tracks rejected GTP Data PDUs due to protocol errors on the Gn interface, differentiated by GTP versions (v0 and v1).
Explanation: The correct answer aligns with the provided context. 'GTP.InDataPktGnGGSN' measures the total number of incoming GTP Data PDUs accepted on the Gn interface from GGSN to SGSN, without differentiation by GTP version. This measurement is valid for packet-switching domains.