What is the purpose of the BEARER CONTEXT RELEASE REQUEST message in the gNB-CU-UP initiated bearer context release procedure?
To release the bearer context in the gNB-CU-CP
To release the bearer context in the gNB-CU-UP
To request the release of the bearer context in the gNB-CU-CP
To request the release of the bearer context in the gNB-CU-UP