Question: What presentation protocol supports the real-time text conversation application in CS Multimedia environment as per 3GPP specifications?
Option 1: ITU-T T.140
Option 2: H.324
Option 3: TS 22.226
Option 4: AL1 (Application Layer 1)
Explanation: The correct answer is ITU-T T.140 because, according to the specifications, this protocol supports the real-time text conversation application in the CS Multimedia environment. H.324 is related but serves as a broader specification that includes T.140 for Global Text Telephony implementation. TS 22.226 provides further requirements for Global Text Telephony but is not a presentation protocol. AL1 is specified as the data protocol for T.140 within H.324, not the presentation protocol itself.