A traffic signal has $4$ colors: Red, Blue, Green, and Yellow. Signals are made by combining any $22$ of these

A traffic signal has $4$ colors: Red, Blue, Green, and Yellow. Signals are made by combining any $22$ of these $44$ colors. How many unique signals can the traffic signal show if the order of the colors defines unique cases?

A) 3
B) 6
C) 8
D) 12
E) 24

Answer: D

Source: e-GMAT

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