Question: What type of protection mechanism is used to protect Non-IP Data Delivery (NIDD) interfaces exposed by the Network Exposure Function (NEF)?
Option 1: IPsec
Option 2: TLS
Option 3: DTLS
Option 4: PGP
Explanation: According to the security architecture and procedures for 5G System, the NIDD interfaces exposed by the NEF use the TLS protection mechanism defined in clause 12 for protection. This ensures secure communication between the UE and the network for non-IP data delivery.