What does the following command accomplish? (Exhibit)

router(config-pmap-c)# shape fecn-adapt

A.
enables the router to lower the shaping rate when BECN bits are received

B.
enables the router to lower the shaping rate when FECN bits are received

C.
enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set

D.
enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set

E.
enables the router to increase the shaping rate when BECN bits are received

F.
enables the router to increase the shaping rate when FECN bits are received

Explanation:

Configure Adaptive Generic Traffic Shaping for Frame Relay Networks If traffic shaping is performed on a Frame Relay network using the traffic-shape rate command, you can also use the traffic-shape adaptive command to specify the minimum bit rate to which the traffic is shaped.
To configure adaptive GTS for outbound traffic on an interface or subinterface , use the following commands in interface configuration mode:

With adaptive GTS, the router uses backward explicit congestion notifications (BECNs) to estimate the available bandwidth and adjust the transmission rate accordingly. The actual maximum transmission rate will be between the rate specified in the traffic-shape adaptive command and the rate specified in the traffic-shape rate command .