Question: In a scenario where an ME (Mobile Equipment) is requesting Third Party root public key(s) using MexE ST service n°3 (EFTPRPK), what action does the ME take if the identified files containing certificate instances are not fully available?
Option 1: The ME skips assembling the certificate instance data and proceeds with authentication.
Option 2: The ME performs a WRITE BINARY command to create a new file for the missing parts.
Option 3: The ME performs READ BINARY commands on the identified files to assemble the complete certificate instance data.
Option 4: The ME aborts the procedure and reports an error due to incomplete data.
Explanation: According to the described process for handling Third Party root public key(s) via EFTPRPK, if the ME identifies files containing certificate instances but finds them incomplete, it will perform READ BINARY commands on these files. This is done to gather all necessary parts and assemble the complete certificate instance data, ensuring the ME can properly analyze and utilize the third-party root public keys for secure communication or authentication purposes in telecom networks.