15 Points!

If the following is a polynomial function, then state its degree and leading coefficient. If it is not, then state this fact.

f(x) = -15x^5 - 7x^4 + 3

A) Degree: -15; leading coefficient: 5

B) Degree: 9; leading coefficient: -15

C) Degree: 5; leading coefficient: -15

D) Not a polynomial function