Question: Which Network Function (NF) may utilize the NRF to discover UCMF instance(s), unless UCMF information is available by other means?
Option 1: AMF, MME, NEF
Option 2: AMF, MME, NEF, AF, SCEF, SCS/AS
Option 3: AF, SCEF, SCS/AS
Option 4: SCP
Explanation: According to the 5G system architecture, multiple Network Functions (NFs) can utilize the NRF to discover UCMF instance(s), unless UCMF information is available by other means. These NFs include AMF, MME, NEF, AF, SCEF, and SCS/AS. This allows for a flexible and dynamic discovery process in the 5G network.