(a) In all proceedings for the probate of a will in common form or solemn form, witnesses to the will may be examined in person or by written interrogatories which shall be answered in writing and under oath before a notary public or by depositions or other discovery procedures under the same circumstances as other civil cases. The probate court shall have the power to compel the attendance of witnesses in the same manner as the superior court.

(b) Where witnesses are to be examined as authorized by this Code section, a photocopy of the will may be exhibited to the witnesses in lieu of the original will. The testimony of a witness to whom a photocopy of a will has been exhibited shall be given the same weight as though the original will had been exhibited to the witness.

(c) The provisions of this Code section shall not be construed as repealing any other statutory provision prescribing a method or procedure for the taking of testimony by interrogatories or depositions, but as supplementary of such other provisions and cumulative to such other provisions and as providing additional means or methods of taking the testimony of subscribing witnesses to a will in proceedings for the probate of the will. The taking or procuring of testimony in the manner prescribed by this Code section shall be sufficient for all purposes of the probate proceedings, notwithstanding any other statute.