Listen The function f(x)=2 cos(x-d) contains the point (1, 1). The equation(s) of this function is/are: a) f(x) = 2 cos(x-3) and f(x) = 2 cos(x+) b) f(x)=2 cos(x+) and f(x) = 2 cos(x-7) c) f(x) = 2 cos(x-4) and f(x) = 2 cos(x+7) d) f(x)=2 cos(x+) and f(x) = 2 cos(x-2)