If a proposal prescribes any conditions concerning the communication of its acceptance, the proposer is not bound unless they are conformed to; but in other cases any reasonable and usual mode may be adopted.
S.D. Codified Laws § 53-7-5
Acceptance of proposal, communication
Source: CivC 1877, § 893; CL 1887, § 3517; RCivC 1903, § 1211; RC 1919, § 826; SDC 1939, § 10.0317.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.