If a party refuses to answer an interrogatory, the opposing party may file a motion to compel an answer. A mo- tion to compel an answer.

a. Will be granted if the moving party shows the answer is necessary to prepare for trial.

b. May be denied if the question asked is subject to a timely and valid objection.

c. May be denied if the question asked is an invasion of privacy of the other party.

d. Will be granted if the opposing party does not file a motion to refuse to respond.

c. None of the above.