Question: What is the correct format for constructing a PGW Set FQDN when the Mobile Network Code (MNC) has only 2 significant digits?
Option 1: set<Set Id>.pgwset.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org (without padding)
Option 2: set<Set Id>.pgwset.epc.mnc0<MNC>.mcc<MCC>.3gppnetwork.org (padding with '0' at the right side)
Option 3: set<Set Id>.pgwset.epc.mnc0<MNC>.mcc<MCC>.3gppnetwork.org (padding with '0' at the left side)
Option 4: set<Set Id>.pgwset.epc.mnc<MNC>mcc<MCC>.3gppnetwork.org (omitting the MCC and MNC separator)
Explanation: According to the specification, if there are only 2 significant digits in the MNC, one "0" digit shall be inserted at the left side to fill the 3 digits coding of MNC in the PGW Set FQDN. This ensures consistency in the formatting of the identifier across different networks.