【单项选择题】
因低舱位超售被安排在高舱位就坐的旅客,其客票上应注明()
A、A、INVOL UP DUE OVERSALE
B、B、NON ENDORSABLE
C、C、NON REFUNDABLE
D、D、UPGRADE FROM Y TO W
A、A、INVOL UP DUE OVERSALE
B、B、NON ENDORSABLE
C、C、NON REFUNDABLE
D、D、UPGRADE FROM Y TO W