The notice required by section 6-320 (d), Idaho Code, shall be served either:

1. (1) By delivering a copy to the landlord or his agent personally; or
2. (2) If the landlord or his agent is absent from his usual place of business, by leaving a copy with an employee at the usual place of business of the landlord or his agent; or
3. (3) By sending a copy of the notice to the landlord or his agent by United States Postal Service certified mail, return receipt requested.

[6-323, added 1977, ch. 45, sec. 7, p. 84.]