Determine Upper and Lower Bounds for the Real Roots of the Equation

Multiple Choice

Determine upper and lower bounds for the real roots of the equation.
5x ⁴ - 10x - 12 = 0

A) 2 is an upper bound, - 1 is a lower bound
B) 8 is an upper bound, - 1 is a lower bound
C) 1 is an upper bound, - 2 is a lower bound
D) 2 is an upper bound, - 4 is a lower bound
E) 8 is an upper bound, - 4 is a lower bound