Question: What determines if a non-3GPP access network is treated as a trusted non-3GPP access network by a home operator?
Option 1: The home operator's policy decision, based on the sufficiency of security feature groups provided by the non-3GPP access network and potentially other non-security related reasons.
Option 2: A mandatory set of security protocols defined by 3GPP that must be implemented by all non-3GPP access networks.
Option 3: The type of User Equipment (UE) used to access the non-3GPP network.
Option 4: The geographical location of the non-3GPP access network.
Explanation: This is correct because, as per telecom security protocols and trust models in heterogeneous networks, trust is often established based on the evaluation of provided security features against predefined criteria. The home operator's policy decision, encompassing both technical (security feature groups) and non-technical aspects, plays a crucial role in determining this trust, allowing operators to tailor their trust models according to specific needs and risk assessments.