Question: In MBMS (Multimedia Broadcast/Multicast Service) using FLUTE (File Delivery over Unidirectional Transport) with RTSP (Real-Time Streaming Protocol), what is the primary purpose of including a "control URI" in the SDP (Session Description Protocol) for the FLUTE media description?
Option 1: To specify the multicast IP address for media streaming
Option 2: To define the audio codec used in the multimedia broadcast
Option 3: To provide a control point for establishing the FLUTE session
Option 4: To indicate the maximum bandwidth allocated for the service
Explanation: The inclusion of a "control URI" (defined by the "a=control:" SDP field) in the context of FLUTE with RTSP is crucial for providing a control point. This control point is essential for managing and establishing the FLUTE session, which is vital for the efficient delivery of files over unidirectional transport in MBMS scenarios. This aligns with the role of RTSP in controlling the playback of multimedia content, making Option 3 the most appropriate answer.