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The nurse practitioner is performing a new patient physical examination on a 51-year-old man. The history reveals that the client's father died of colon cancer. What priority diagnostic tests are used to screen this client?
a) Barium enema and upper Gl series.
b) Carcinoembryonic antigen (CEA) titer and sigmoidoscopy.
c) Proctoscopy and biopsy.
d) Fecal occult blood testing, flexible sigmoidoscopy, and colonoscopy.