What are the solutions of the equation x4 + 95x2 – 500 = 0? Use factoring to solve

What are the solutions of the equation x4 + 95x2 – 500 = 0? Use factoring to solve.
a. x=± sqrt 5 and x = ±10
b. x=± sqrt i5 and x = ±10i
c. x=± sqrt 5 and x = ±10i
d. x=± sqrt i5 and x = ±10