Question: In a Universal Subscriber Identity Module (USIM) Application Toolkit (USAT), for an EVENT DOWNLOAD command with a 'call connected' event, what device identities are set when the call is initiated from the Mobile Terminal (MT call)?
Option 1: Source: Network; Destination: ME
Option 2: Source: ME; Destination: UICC
Option 3: Source: UICC; Destination: Network
Option 4: Source: Network; Destination: Network
Explanation: According to the USIM Application Toolkit specifications for EVENT DOWNLOAD commands, when a call is connected at the near end (i.e., an MT call, where the Mobile Terminal initiates the call), the device identities are set with the 'Source' as the ME (Mobile Equipment) and the 'Destination' as the UICC (Universal Integrated Circuit Card). This setup reflects the direction of the call initiation in relation to the mobile device's components.