Question: In a wireless PSS (Packet-switched Streaming Service) environment, what is the primary purpose of a PSS client sending 'wellness' information to the PSS server at defined intervals?
Option 1: To adjust video streaming quality based on real-time network conditions.
Option 2: To synchronize audio and video streams for better user experience.
Option 3: To authenticate the client's identity before initiating a stream.
Option 4: To enable the server to detect the client's link aliveness during an active PSS session.
Explanation: In wireless environments, connections can be lost due to various factors (e.g., fading, battery loss). Sending 'wellness' information at intervals helps the server verify that the client is still connected and active, ensuring the PSS session remains valid. This mechanism is crucial for managing sessions efficiently and making informed decisions about resource allocation on the server side.