Question: What type of certificates shall network functions support, according to the security architecture and procedures for 5G System?
Option 1: Both server-side and client-side certificates
Option 2: Only server-side certificates
Option 3: Only client-side certificates
Option 4: Neither server-side nor client-side certificates
Explanation: According to the security architecture and procedures for 5G System, network functions shall support both server-side and client-side certificates. This is specified in the context of mutually authenticated TLS and HTTPS, where the identities in the end entity certificates are used for authentication and policy checks.