(1) An improvement notice may be—
(a) given to a person to whom or which it relates; or
(b) given to a person apparently in charge of any activity, building, place of work, plant, process, situation, structure, or substance to which the provision of this Act that the inspector believes has not been complied with applies; or
(c) posted to any such person by registered letter.
(2) An improvement notice posted under subsection (1)(c) shall be deemed to have been received on the seventh day after it was posted.