Which of the following describes the zeroes of the graph of f(x) = 3x6 + 30x5 + 75x4?

Which of the following describes the zeroes of the graph of f(x) = 3x6 + 30x5 + 75x4?
a. –5 with multiplicity 2 and 1/3 with multiplicity 4
b. 5 with multiplicity 2 and 1/3 with multiplicity 4
c. –5 with multiplicity 2 and 0 with multiplicity 4
d. 5 with multiplicity 2 and 0 with multiplicity 4