Question: In a GPRS network, according to the 3GPP naming convention for GSNs (GPRS Support Nodes), how would an SGSN with ID 'A', MCC (Mobile Country Code) '12', and MNC (Mobile Network Code) '5' be logically named in a DNS server?
Option 1: sgsnA.mnc005.mcc012.gprs
Option 2: sgsn000A.mnc05.mcc12.gprs
Option 3: sgsnA00.mnc005.mcc12.gprs
Option 4: sgsn0A00.mnc005.mcc012.gprs
Explanation: According to the naming convention, SGSN IDs (XXXX) must be hex-coded digits and always fill 4 digits (padding with '0' if necessary), MNC (YYY) must be encoded as single digits filling 3 digits (padding with '0' if necessary), and MCC (ZZZ) also follows a similar padding rule for its digit representation. Thus, SGSN ID 'A' becomes '0A00', MNC '5' becomes '005', and MCC '12' becomes '012', leading to the correct logical name as per the specified conventions.