Conditional formating: text color

J

John

Column A is the date a project was assigned.
Column B has the date the project is due.
Column C is the date the project was completed.
Column D is the number of days remaining before the
project is due. (date project due-now)

I want the text in column D to be:
black if greater than or equal to zero and C is null.
red if it is a negative number and C is null.
white if c is not null

How do I set up the conditional formating to do this?
 
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