When the aircraft batteries is the only source of power:

When the aircraft batteries is the only source of power:

A.A.The Captain\'s inboard and outboard displays operate until the battery is discharged and the First Officer\'s inboard and outboard displays operate for a minimum of 5 minutes

B.B.The Captain\'s inboard and outboard displays operate until the battery is discharged

C.C.The Captain\'s inboard and the First Officer\'s inboard and outboard displays are inoperative

D.D.Both the Captain\'s and First Officer\'s PFD/ND displays remain operative but only DEU No 1 is powered until the battery is discharged

正确答案是B