Question: In the context of the `3GPP-Asset-Information` attribute in SDP for Transparent end-to-end Packet-switched Streaming Service (PSS), what is the primary purpose of the `URL` component within an `Asset`?
Option 1: To specify the encoding scheme used for asset boxes.
Option 2: To provide a direct link to additional asset information, such as XHTML pages or XML files.
Option 3: To define the structure of the asset name-value pairs.
Option 4: To indicate the supported media formats for streaming.
Explanation: The `URL` component within an `Asset` in the `3GPP-Asset-Information` attribute is designed to point to external resources (e.g., XHTML pages, XML files) that contain additional asset information. This allows for flexible and dynamic provision of metadata, enhancing the user experience by providing more context about the streamed content. The client's capability and user preferences determine how this referenced information is rendered.