Question: What is a requirement for the Contact Manager Server and External Client when exchanging device capabilities, specifically regarding unsupported content formats like vCard3.0?
Option 1: The server must always send all its device-specific data, including unsupported formats.
Option 2: The server should send only the supported properties but include all device-specific data for future compatibility.
Option 3: The server shall not send its device-specific data for unsupported formats (e.g., vCard3.0 if the client doesn't support it).
Option 4: The decision to send or not send unsupported formats is left to the server's implementation choice.
Explanation: This requirement ensures efficient communication by avoiding the transfer of unnecessary data. If a Contact Manager External Client indicates it does not support a particular content format (like vCard3.0), the Contact Manager Server optimizes the exchange by not sending the unsupported properties, thus reducing bandwidth usage and enhancing interoperability. This approach aligns with the principles of device capability exchange defined in OMA DS, focusing on utilizing only compatible formats for effective communication.