Question: Upon receiving a `SEND SS` command, under which condition(s) may the Mobile Equipment (ME) inform the user about sending an SS request?
Option 1: If the alpha identifier provided by the UICC is not null and has a length greater than '00'.
Option 2: If the ME is busy on an SS transaction or a USSD transaction.
Option 3: If no alpha identifier is provided by the UICC.
Option 4: If the SS request is unsuccessfully received by the network.
Explanation: According to the specifications, if the alpha identifier is not provided by the UICC, the ME may give information to the user concerning what is happening (i.e., sending an SS request). This aligns with the condition where the absence of an alpha identifier from the UICC leaves the decision to inform the user at the ME's discretion.