Final answer:
Certification for both the technologist and technician exams is granted on a two-year basis, with professionals required to renew their credentials to maintain their certification.
Step-by-step explanation:
The certification for both the technologist and technician exams is renewed on a two-year basis, option C. Healthcare certification bodies generally require certified professionals to renew their credentials periodically to ensure they maintain up-to-date knowledge and skills in their field. This process typically involves obtaining continuing education units, paying a recertification fee, and sometimes passing a recertification exam.