Question: In the context of WebRTC IMS Client registration, what type of authentication is required for the W1 interface when an anonymous user is involved?
Option 1: Mutual Authentication (both WIC and WWSF authenticate each other)
Option 2: One Way Authentication (WWSF needs to authenticate WIC)
Option 3: No Authentication Required
Option 4: One Way Authentication (WIC needs to authenticate WWSF)
Explanation: According to the security requirements for WebRTC IMS Client registration, when an anonymous user is involved in the W1 interface (between WIC and WWSF), one way authentication is mandated, specifically requiring the WIC to authenticate the WWSF. This ensures a level of security while accommodating the anonymity of the user.