A ratification can be made only in the manner that would have been necessary to confer an original authority for the act ratified or, whenever an oral authorization would suffice, by knowingly accepting or retaining the benefit of the act.
Mont. Code Ann. § 28-10-211
How agent's act ratified
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.