The Altitude Disagree Alert (amber 'ALT DISAGREE') on the digital altimeter indicates the Captain's & F/O's altitude indications disagree by more than:
A.A.50 feet
B.B.100 feet for more than 2 continuous seconds
C.C.200 feet for more than 5 continuous seconds
D.D.500 feet for more than 10 continuous seconds
正确答案是C