Question: What formats shall a PSS (Packet-switched Streaming Service) client support for initial session descriptions, according to 3GPP specifications?
Option 1: Only SDP (Session Description Protocol) for all types of content
Option 2: SDP or plain SP URL, with support for URLs starting with rtsp://, file://, and http://
Option 3: HTML, WML, and 3GP formats for embedded and downloadable content
Option 4: Exclusive support for HTTP protocol for all initial session descriptions
Explanation: A PSS client must be versatile in handling different formats for initial session descriptions to accommodate various content sources and user selections. Supporting SDP or plain SP URL, along with URLs that start with rtsp:// (for streaming), file:// (for local files), and http:// (for web-delivered content), ensures compatibility with a wide range of scenarios as outlined in the 3GPP specifications for effective session establishment.