Question: What is NOT a key requirement for the Contact Manager Server in terms of client support, as per 3GPP UICC application specifications?
Option 1: The Contact Manager Server must support only one External client for simplicity.
Option 2: The Contact Manager Server shall support at least two External clients.
Option 3: The number of supported External clients is dependent on the OMA DS server configuration.
Option 4: Supporting External clients is optional for the Contact Manager Server.
Explanation: According to the specifications, the Contact Manager Server is required to support more than one external client, making Option 1 (supporting only one External client) an incorrect requirement. This highlights the server's actual need to handle multiple connections in telecom network scenarios.