The ERX Edge Router responds to a received PPP over Ethernet Active Discovery Initiation （PADI） with which message type？（）

A.ip route 40.40.0.0 255.255.0.0 172.10.1.2
B.ip route 40.40.0.0 0.0.255.255 atm 6/0.33
C.ip route 40.40.0.0 0.0.255.255 172.10.1.2
D.ip route 40.40.0.0 255.255.0.0 atm 6/0.33

A.redistribute direct
B.redistribute static
C.redistribute connected
D.redistribute access-internal

A.atm pvc 33 0 33 aal5snap
B.atm pvc 33 0 33 aal5bridge
C.atm pvc 33 0 33 bridge1483
D.atm pvc 33 0 33 1483bridge