Question: What determines the usage and provision of the TP-Command-Data field in SMS?
Option 1: TP-Command-Type field
Option 2: Maximum length of the TP-Command-Data field (157 octets)
Option 3: Type of User Equipment (UE) initiating the SMS
Option 4: Short Message Service Center (SC) configuration
Explanation: The usage and provision of the optional TP-Command-Data field are directly dependent on the function selected by the TP-Command-Type field, controlling the behavior of other fields within the SMS protocol for proper interpretation and execution at the Short Message Service Center (SC).