The input values of x = {2, 3, 4, 5} result in output values of f(x) = {4, 6, 8, 10}. Note that each of the values of x and f(x) line up (e.g., when x = 2, f(X) = 4). What function represents this relationship? O f ( x ) = 2 O f ( x ) = - 3 x O f ( x ) = 2x O f ( x ) = - 3x2 f ( x ) = x + 5