Question: In an MBMS security context, what data is transmitted when the mode is set to '03'?
Option 1: Only the MIKEY message
Option 2: MUK ID TLV containing full MUK identifier details
Option 3: Key Domain ID and Key Group part of the MSK ID (with the last byte being the least significant byte of the Key Group)
Option 4: The entire MBMS Security Context Response parameters, including all modes (MSK Update, MTK Generation, MSK and MUK Deletion)
Explanation: According to MBMS security context specifications, in mode '03', the transmitted data consists of the Key Domain ID concatenated with the Key Group part of the MSK ID, where the last byte of the Key Group part is its least significant byte, unique to this mode.