Kenyon is a supervisor at Rhombus Inc. Maggie has been the top performing employee last year, but her performance has sharply declined over the last two months and her tardiness is becoming an issue. In this scenario, Kenyon should: 

a. encourage Maggie to become involved in the company's wellness program 

b. issue a warning to Maggie and find her replacement soon 

c. refer Maggie to the company's employee assistance program

d. advise Maggie to become a member of a command group