Question: In a Mission Critical (MC) system architecture, what is the implication for an HTTP proxy regarding communication with another HTTP entity in a different trust domain?
Option 1: An HTTP proxy can pass requests to another HTTP proxy in a different trust domain, but not responses.
Option 2: An HTTP proxy shall not pass requests or responses to another HTTP proxy, an HTTP server, or an HTTP client in a different trust domain.
Option 3: An HTTP proxy can communicate freely with other HTTP entities across different trust domains for MC services.
Option 4: The restriction on HTTP proxies communicating across trust domains only applies to MC service providers, not PLMN operators.
Explanation: This is correct because the rules implied for functions in different trust domains within an MC system architecture specifically state that an HTTP proxy shall not pass requests or responses to another HTTP proxy, an HTTP server, or an HTTP client in a different trust domain, ensuring security and privacy by preventing sensitive information from being shared across trust boundaries without explicit agreements.