When connecting a ribbon cable to a connector, how do you know which direction to plug it in?

Q. When connecting a ribbon cable to a connector, how do you know which direction to plug it in?

A.            The red line in the cable goes to the highest pin number

B.            The colored line in the cable goes to pin #1

C.            It does not matter

D.            None of these

Answer: The colored line in the cable goes to pin #1