Question: What is a required functionality of a User Equipment (UE) in the context of Generic Bootstrapping Architecture (GBA), specifically for secure communication protocols?
Option 1: Support for only TLS 1.2 and above
Option 2: Support of HTTP Digest protocol according to RFC specifications with additional profiling
Option 3: Capability to exclusively use SIP over TCP
Option 4: Support for IKEv2 for IPsec tunnel establishment
Explanation: In the context of GBA, secure authentication and bootstrapping are crucial. The correct answer highlights a specific requirement for UEs to ensure secure communication over HTTP interfaces, essential for authenticating users and devices securely.