Question: In an MBMS (Multimedia Broadcast/Multicast Service) streaming session SDP (Session Description Protocol) description, how is the source-filter attribute utilized for specifying IP source addresses?
Option 1: Multiple source-filter attributes can be used per media description for both IPv4 and IPv6 sources.
Option 2: The source-filter attribute is only specified in the media part of the SDP for each type of media (e.g., audio, video).
Option 3: Exactly one source-filter attribute is used per complete MBMS streaming session SDP description, located in the session part, specifying exactly one source address.
Option 4: The source-filter attribute is not required for IPv6 sources if an IPv4 source is already specified.
Explanation: This is correct because there should be exactly one source-filter attribute per complete MBMS streaming session SDP description, placed in the session part, specifying one source address for inclusive-mode, ensuring a unified source across the session for efficient network routing and reception.