Which statement is true about configuring a back-to-back connection frame-relay on Juniper Routers?（）

A.Both DTE and DCE will send keep-alives by default so no special configuration is required.
B.The circuit is negotiated automatically so no special configuration is required.
C.All equipment is by default DTE, one side should be set to DCE
D.All equipment is by default DCE, one side should be set to DTE