A mere offer of guaranty is not binding until notice of its acceptance is communicated by the guarantee to the guarantor, but an absolute guaranty is binding upon the guarantor without notice of acceptance.
Mont. Code Ann. § 28-11-106
When notice of acceptance necessary to bind guarantor
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.