Question: What is the outcome when `+CUSATD=2` is set before a restart, and no `+CUSATA=2` or `+CUSATA=3` command is sent during start-up?
Option 1: The UICC will automatically download the combined TE and MT profile.
Option 2: USAT (Universal Subscriber Identity Module Application Toolkit) will be blocked for the Mobile Terminal (MT).
Option 3: The UICC will enter a state of continuous restart.
Option 4: The MT will ignore the `+CUSATD` setting and proceed with default start-up behavior.
Explanation: According to specifications, when `+CUSATD=2` is set (meaning 'Halt next UICC start-up when ready for profile download'), if no `+CUSATA=2` or `+CUSATA=3` command is sent during start-up to select and trigger the profile download, USAT will be blocked for the MT. This highlights the importance of sending the appropriate `+CUSATA` command after setting `+CUSATD=2` to avoid unwanted states in USAT.