Landing autobrake settings may be selected after touchdown:
A.A.However the AUTO BRAKE DISARM light will illuminate and autobrake application will not occur.
B.B.However autobrake action will occur only when both thrust levers are retarded to reverse thrust range.
C.C.Prior to decelerating through 60 kts groundspeed.
D.D.After decelerating through 60 kts groundspeed
正确答案是C