Commas are used to separate two or more adjectives.

Commas are used to separate two or more coordinate adjectives. Coordinate adjectives are adjectives that are written in a row, What makes these types of adjectives different is that they separately modify a noun. For example, tall, dark, and handsome. Each describe a separate feature of the subject. 

I’d go with letter d

The answer is the father was relieved, the officer was tired.