In this exercise, an Assertion is followed by the Reason. Choose the suitable answer from the given options.
 
Assertion (A): \(ABCD\) is a parallelogram with vertices \((A(x_1, y_1)\), \(B(x_2, y_2)\), \(C(x_3, y_3)\). The coordinate of the fourth vertex \(D\) in terms of \(x_1, x_2, x_3, y_1, y_2\) and \(y_3\) is \((x_1 - x_3 - x_2, y_1 - y_3 - y_2)\).
Reason (R): The mid point of a line segment divides the segment in the ratio \(1:1\).