What is the valid colors?

Question

1-#0fEEDO
2-#00ACEO
3-#0FACEO
4-#0FIL00

Answer 1

None of them

Answer 2

all.. except for the last

Answer 3

Is the character at the end supposed to be a zero, or the letter 'o'?

If it's zero, the first 3 are valid. If it's 'o', none.

Answer 4

None of them is valid
only hexadecimal values is accepted
ie from 0 to f