Claim of a mother for the benefits to which she may be entitled by reason of her unmarried status as outlined in section 202(c) or section 312(c)3 of the Act, as amended, shall be supported by a statement of fact, under oath, of such status, together with one of the following:
(a) Certified copy of public record of death of the husband.
(b) Certified copy of court record of divorce decree.