(a) to preserve a privilege or right of confidentiality;

(b) to enforce a limitation set forth in an order of a court; or

(c) when the question is plainly improper and would, if answered, cause significant prejudice to any person. An attorney shall not direct a deponent not to answer except as provided in CPLR Rule 3115 or this subdivision. Any refusal to answer or direction not to answer shall be accompanied by a succinct and clear statement of the basis therefor. If the deponent does not answer a question, the examining party shall have the right to complete the remainder of the deposition.