Answer:
D. Certification
Step-by-step explanation:
Certification can be defined as an official document issued to someone by an institution of learning to attest and confirm that he or she has completed a course of study, attained a level of achievement (educational status) or passed an examination. The certification is to certify or confirm that the individual is a professional in that course of study or field. Some examples of certifications are CCNA, Comptia A+, HSE I and II, Open CA, CSA etc.
Generally, certifications are only issued to someone when they have been made to undergo a certification test and are successful in the test. This ultimately implies that, the individual is knowledgeable and competent enough to practice in a particular occupational area or field.
Hence, Architects, Lawyers, Physicians, Pharmacists and Psychologists require certification.