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an is a courteous, supportive, and diligent employee who frequently assists his colleagues in making sales at the auto dealership. He is also I$1-$liked by customers for his customer$-$centric approach. However, despite these qualities, Ryan faces termination based on his performance essment, which primarily emphasizes sales metrics. What fundamental issue underlies his unsatisfactory performance review?

a$.$ criterion deficiency

b$.$ lack of reliability

c$.$ criterion contamination

d$.$ lack of relevance