Question: In a scenario where a USIM modifies a `SET UP CALL` or `SEND SS` proactive command into a USSD request with a '05' result value, what information does the Text string 2, supplied by the ME in the TERMINAL RESPONSE, typically contain?
Option 1: The original proactive command details before modification by the USIM.
Option 2: Error codes indicating failure of the USSD request at the network level.
Option 3: A confirmation of the successful modification by the USIM.
Option 4: The text returned within the Return Result message from the network for the USSD response.
Explanation: When a USIM alters a command into a USSD request and it's successfully processed, the response from the network (containing the outcome of the USSD interaction) is what's crucial for feedback. Thus, Text string 2 is designed to convey this network response text, ensuring transparency about the USSD operation's result.