Question: In a media profile defined by `+CDEFMP`, what is the implication of including a partial SDP m-line (containing only a media type) in the `<SDP_md>` parameter, as opposed to a full SDP m-line?
Option 1: The MT will handle encoding/decoding for the specified media type, and the TE must provide payload information.
Option 2: The TE is responsible for encoding/decoding the media, and the MT will add necessary payload details during media negotiation.
Option 3: The inclusion of a partial SDP m-line indicates that the media session will be handled externally to both the MT and TE.
Option 4: Partial SDP m-lines are not supported in `<SDP_md>` for `+CDEFMP` commands.
Explanation: According to the specification, a partial SDP m-line (containing only a media type) indicates that the described media is encoded/decoded by the Mobile Terminal (MT). When negotiating media, the MT adds payload information to the partial SDP m-line. This implies that the responsibility for encoding/decoding lies with the MT, and it will also handle adding necessary payload details, making Option 2 the correct answer.