Certifications are common in all of the options except : ( C ) engineering
What is certification ?
Certification is a documentation presented or awarded to an individual in testament to professionalism or ability to perform certain tasks by a regulated and authorised body.
Although some level of certification is required to perform engineering works but it is not very common, what is more common in engineering is the ability to carry your duties by passing an engineering test set by your employers aside your certification.
Hence we can conclude that Certifications are common in all of the options except : ( C ) engineering
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