Question: In the default APN Operator Identifier format "mnc<MNC>.mcc<MCC>.gprs", how are Mobile Network Codes (MNC) with only 2 significant digits represented to meet the 3-digit coding requirement?
Option 1: The 2 significant digits are appended with a random digit to fill the 3-digit coding.
Option 2: The 2 significant digits are prepended with a "0" digit to fill the 3-digit coding.
Option 3: The 2 significant digits are postpended with a "00" to ensure a unique identifier, exceeding the 3-digit requirement for consistency.
Option 4: No modification is made; the MNC remains as is, even if it's less than 3 digits.
Explanation: To maintain consistency and meet the 3-digit coding requirement for MNC in the APN Operator Identifier format, a single "0" digit is inserted at the left side (prepended) to MNCs with only 2 significant digits. This ensures uniformity in DNS translations across different PLMNs.