Question: What type of connection uses the identities AMF UE NGAP ID and RAN UE NGAP ID?
Option 1: UE-associated logical Xn-connection
Option 2: UE-associated logical F1-connection
Option 3: UE-associated logical NG-connection
Option 4: UE-associated logical E1-connection
Explanation: According to the text, the UE-associated logical NG-connection uses the identities AMF UE NGAP ID and RAN UE NGAP ID. This connection is established during the first NGAP message exchange between the NG peer nodes and is maintained as long as UE associated NGAP messages need to be exchanged over the NG interface.