What is not true concerning ATM to FR Service Interworking?

A.
The VPI/VCI is mapped to the FR DLCI.

B.
The IWF supports the mode of mapping FR DE to the CLP of each ATM cell belonging to that frame.

C.
The IWF supports the mode of mapping FR FECN to the EFCI of each ATM cell belonging to that frame.

D.
The FR Command/Response fields are mapped to the corresponding ATM PTI fields.

E.
On the egress towards the FR CPE, the DE is set ONLY if all cells belonging to that frame are set.