ANSWER
Function q(x) = f(x - 2) supports his claim
Step-by-step explanation
Function r(x) = f(x) - 2 would translate the graph 2 units down, so the vertex would be at (0,0)
Function s(x) = f(x) + 2 would translate the graph 2 units up, so the vertex would be at (0, 4) and the