Four polynomials are shown below: a. 3 − 7x5 + x2 b. 5x3 + 5 − 3x c. 3x + 2x3 − x2 + 6 + 2x d. 3x3 − 5 + 2x5 + x + 2x2 which of the above polynomials is a 5th degree trinomial? polynomial a polynomial b polynomial c polynomial d