Using full stop increments, what are 3 sets of equivalent exposures for f/5.6 - 1/125?
a) f/11 - 1/500, f/8 - 1/250, f/4 - 1/125
b) f/16 - 1/250, f/11 - 1/125, f/8 - 1/60
c) f/4 - 1/60, f/5.6 - 1/125, f/8 - 1/250
d) f/8 - 1/125, f/11 - 1/250, f/16 - 1/500