(a) A license holder shall display the current original license certificate issued by the department in the primary location of practice, if any, or in the license holder's business office.(b) In the absence of a primary location of practice or business office, or when the license holder is employed in multiple locations, the license holder shall carry a current license identification card issued by the department.(c) A license holder shall not:(1) display a photocopy or other reproduction of a license certificate or identification card; or(2) alter a license certificate or identification card.