Question: What specific configuration in the EFACC (Access Control) file of a USIM dedicated for IOPS prevents UEs with different Access Control Classes from attaching to the IOPS network?
Option 1: Setting the Access Control Class to '00' or '01'
Option 2: Setting the Access Control Class to either '11' or '15'
Option 3: Disabling the AMF (Authentication Management Field) mechanism
Option 4: Using a generic label in EFDIR instead of starting with 'USIM-IOPS'
Explanation: Setting the Access Control Class in EFACC to either '11' or '15' ensures only UEs with matching Access Control Classes can attempt to attach to the IOPS network, enhancing security and access control, and maintaining the integrity of the IOPS network by restricting unauthorized access.