What is not true concerning ATM to FR Service interworking?

A.
The ATM CPE uses AAL5 SAR and AAL5 common part convergence sublayer

B.
The IWF supports the mode of setting the ATM CLP to ‘congestion not experienced’ regardless of the FR DE setting

C.
In the ATM to FR direction, it the EFCI field in the last cell of a segmented frame received is set to ‘congestion experienced,’ then FECN is set to ‘congestion experienced.’

D.
In the ATM to FR direction, it the EFCI field in the first cell of a segmented frame received is set to ‘congestion experienced,’ then FECN is set to ‘congestion experienced.’

Explanation: