Which equation of f(x) reveals the minimum or maximum value of f(x) without changing the form of the equation? A. f(x)=x^2- 2x - 4x+8
B. f(x)= (x-4)(x-2)
C. f(x) = (x - 3)^2-1
D. f(x) =x^2-6x+8

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?