The correct answer would be option A, Certification.
If a person wants to practice on their own without working for an employer, the person must has the certification.
Explanation:
If a person does not want to work under an employer, and wants to work on his own, then he has to make sure that he has the required degree, skill and knowledge about that work, so that he can start his own work. For this purpose, he needs to have a certification.
For example, if a nurse who specializes in the nutrition field, will have the certificate of the field. If she does not want to be associated with some employer, she can work independently just by showing her certification to other for the purpose of surety that she has the required knowledge and skills to do the job.
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