Six Basic Colours Are to Be Used in Decorating a New

Six basic colours are to be used in decorating a new condominium. They are to be applied to a unit
In groups of four colours. One unit might have gold as the principal colour, blue as a complementary
Colour, red as the accent colour and touches of white. Another unit might have blue as the principal
Colour, white as the complimentary colour, gold as the accent colour and touches of red. If
Repetitions are not permitted, how many different units can be decorated?

A) 360
B) 25
C) 125
D) 1,296