If f(x)=x², which of the following describes the graph of f(x - 1)?OA.The graph of fx-1) is a vertical shift of f(x)=x2² one unit down.OB. The graph of fx-1) is a horizontal shift of f(x) = x² one unit to the left.The graph of f(x-1) is a horizontal shift of f(x) = x² one unit to the right.OD. The graph of fx-1) is a vertical shift of f(x) = x² one unit up.O C.