Question: What is the primary purpose of the Client Credentials Assertion (CCA) in the context of NF-NF communication?
Option 1: To provide integrity protection on the full service request.
Option 2: To enable the NF Service Producer to authenticate towards the NF Service Consumer.
Option 3: To allow the NF Service Consumer to authenticate towards the receiving end point by including a signed token in a service request.
Option 4: To establish cross-certification process between two PLMNs for roaming cases.
Explanation: The CCA is primarily used to enable the NF Service Consumer to authenticate towards the receiving end point (NRF, NF Service Producer) by including a signed token in a service request. This allows the NF Service Consumer to prove its identity and establish trust with the NF Service Producer.