Which statement about the LTE EPC MME function is true?

[answerhappygod]

Which statement about the LTE EPC MME function is true?

A. It acts as the interface between the LTE network and packet data networks, such as the Internet or IMS networks.
B. It provides control, mobility, and user plane support between the existing 2.5G and 3G networks and the EPC.
C. It resides in the user plane, where it forwards and routes packets to and from the eNodeB and PGW.
D. It resides in the control plane and manages states, authentication, paging, and mobility nodes.
E. It is responsible for interworking between the EPC and untrusted non-3GPP networks.