A2 Which of the following properties does the function $f$ with the rule $f(x)=2(x-1)-4$ have?
(A) The function is decreasing.
(B) The initial value of the function is -4.
(C) The slope of the function is 2.
(D) The graph of the function intersects the x-axis at $x=-6$.
(E) The function is positive for all real numbers.