Which function is a polynomial function with degree 5?

Which function is a polynomial function with degree 5?

a.                  F(x)= 5×2+ 6×3

b.                  F(x)= 7×2− 2x+ 1

c.                  F(x)= 7×5+ 2×3+            

d.                  F(x)=x2+ 2x+ 5

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