Question: What is a prerequisite for using the IMC (IP Multimedia Card) for IMS access, specifically in relation to ISIM or USIM presence?
Option 1: The IMC must be part of the ISIM or USIM to enhance security.
Option 2: The presence of ISIM or USIM is irrelevant to IMC usage for IMS access.
Option 3: The IMC can only be used if both ISIM and USIM are present simultaneously.
Option 4: The IMC shall not be used if ISIM or USIM is present, as per security requirements.
Explanation: This correct answer highlights a crucial security requirement specified for the IMC's usage in IMS access scenarios. The presence of either an ISIM (IMS Subscriber Identity Module) or a USIM (Universal Subscriber Identity Module) indicates that more secure, standardized authentication methods are available, making the IMC unnecessary for security purposes. This ensures that when more secure modules are present, reliance on them is mandated to maintain the integrity of the access security framework in IP-based services, aligning with 3GPP's security architecture principles.