Question: In a 3GPP-compliant USIM application, what is a prerequisite for the Mobile Equipment (ME) to perform WLAN selection procedures?
Option 1: The ME must have an active cellular connection.
Option 2: The user must have changed the User controlled WSIDs at least once.
Option 3: The USIM application must support only service n°62 for WLAN.
Option 4: At least one of the services (n°62, n°63, n°81, n°82, n°83, n°84, or n°88) must be marked as 'available'.
Explanation: For the ME to initiate WLAN selection procedures correctly, it needs access to specific configuration files, which are only accessible if at least one of the mentioned services is marked as 'available', ensuring the ME can read necessary parameters to perform WLAN selection.