choose the correct answer.Describe the behavior of f(x)=3x^2 for all values of x. Responses f (x) is decreasing for all x. f (x) is decreasing for all x. f (x) is decreasing for all x < 0 and is increasing for all x > 0. f (x) is decreasing for all x < 0 and is increasing for all x > 0. f (x) is increasing for all x < 0 and is decreasing for all x > 0. f (x) is increasing for all x < 0 and is decreasing for all x > 0. f (x) is increasing for all x