What type of polynomial is 1/7−7x2+5x4+x5−8x? How many terms, the constant term, the leading term, and the leading coefficient?
a. Quadratic; 5 terms; −1/7; x5; 5
b. Cubic; 6 terms; 1/7; x5; 1
c. Quartic; 5 terms; 1/7; x5; 1
d. Quintic; 6 terms; 1/7; x5; 5