Question: In a Short Message Service (SMS) context, as per 3GPP specifications, what does the TP-Recipient-Address (TP-RA) field primarily indicate in a mobile-originated message's status report?
Option 1: The sending User Equipment's (UE) phone number.
Option 2: The destination Short Message Entity's (SME) address for the original mobile-originated short message.
Option 3: The serving Mobile Switching Center's (MSC) identifier.
Option 4: The home network's Short Message Service Center (SMSC) address.
Explanation: The correct answer, Option 2, is based on the understanding of SMS protocol as defined by 3GPP. The TP-Recipient-Address field in a status report for a mobile-originated message logically points to the intended recipient's SME (Short Message Entity) address, which was the destination of the original message. This field's purpose is to identify where the original message was sent, aligning with how SMS protocols manage message delivery and reporting.