The creditor must make objections to the mode of an offer of performance at the time it is made to the creditor. If this is not done, any objection which could have been obviated at that time is waived by the creditor's failure to make the same.
N.D. Cent. Code § 9-12-18
Offer of performance - Mode - Waiver of objections
Official source: North Dakota Legislative Branch. Reproduced from public-domain North Dakota statutes; confirm against the official source for the current text. Not legal advice.