Question: What is the implication of EFInvScan (Investigation Scan) being absent in the USIM application when Service n°40 is 'available'?
Option 1: The USIM will automatically perform an investigation scan for all available PLMNs.
Option 2: The investigation scan for higher prioritized PLMNs offering voice services will be skipped.
Option 3: No investigation scan shall be performed for higher prioritized PLMNs not offering voice services.
Option 4: The USIM application will prompt the user to manually select a PLMN for investigation.
Explanation: If EFInvScan (Investigation Scan) is not present, no investigation scan shall be performed. This directly relates to higher prioritized PLMNs not offering voice services, meaning such scans will not occur.