Question: What is the primary implication for the Mobile Equipment (ME) when it receives a '93 00' status response from the SIM for an ENVELOPE command?
Option 1: The ME must abort all ongoing SIM Application Toolkit processes to prevent overload.
Option 2: The ME can re-issue the ENVELOPE command at a later stage, as the response indicates a temporary unavailability of the SIM's processing resource.
Option 3: The ME should immediately switch to an alternative application or interface to bypass the SIM for the current task.
Option 4: The '93 00' response signifies a permanent error, requiring the ME to reset its connection with the SIM.
Explanation: Receiving a '93 00' status response (BUSY) from the SIM for an ENVELOPE command indicates that the SIM is temporarily unable to process the command due to resource constraints (e.g., other processes running). This response does not affect normal GSM operations, implying the ME can safely retry the command later when the SIM's resources are available. This approach aligns with managing temporary resource unavailability without disrupting overall system functionality.