(b) Service of such notice shall be made either:
(1) By delivering a copy to the person being assessed; if the person is an individual, to the individual; if the person is a partnership, to any partner; if the person is a corporation, association, exchange, or other entity or organization, to any officer of such entity; if the person is an employee benefit plan, to a trustee of such plan; or to any attorney representing any such person;
(2) By leaving a copy at the principal office, place of business, or residence of such individual, partner, officer, trustee, or attorney; or
(3) By mailing a copy to the last known address of such individual, partner, officer, trustee, or attorney.
If service is accomplished by certified mail, service is complete upon mailing. If done by regular mail, service is complete upon receipt by the addressee.