(A) A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.
(B) A branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.
(C) A branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.
(D) A branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

