Okla. Stat. tit. 60, § 60-45: Notice of termination

The notice prescribed by the last section must be in writing,

and must be served by delivering the same to the tenant, or to some

person of discretion residing on the premises; or if neither can,

with reasonable diligence, be found, the notice may be served by

affixing it on a conspicuous part of the premises, where it may be

conveniently read.