AN FMC failure is shown by:
A. the message ‘FMC FAIL’ in the CDU scratch pads
B. red ‘FAIL’ lights on the CDUs
C. blank displays on the CDUs
D. ‘FMC’ displayed on the CDUs, amber ‘FAIL’ lights on the CDUs, and the ‘FMC’ light illuminated on each autoflight status annunciator