derivative of a polynomial function

[ffuh205]

The derivative of a polynomial function is also a polynomial.

A. Always false, 100% of the time.

B. Mostly true, there are a few exceptions

C. Always True, 100% of the time

D. Mostly false, but is true once in awhile

I know B is false, I'm leaning towards A or D.

 

[BigGlenntheHeavy]

\(\displaystyle Unless \ you \ can \ show \ me \ a \ counter-example, \ I \ would \ go \ with \ C.\)