What is the end behavior of the function f(x)=8x^5-3x^3+8x+5 a) as x approaches infinity, f(x) approaches negative infinity and as c approaches negative infinity f(x) approaches infinity
b) as x approaches infinity f(x) approaches infinity and as x approaches negative infinity f(x) approaches negative infinity
c) as x approaches infinity f(x) approaches negative infinity and as x approaches negative infinity f(x) approaches negative infinity
d) as x approaches negative infinity f(x) approaches infinity and x approaches infinity f(x) approaches infinity