Two identical 1-phase transformers 1 and 2, each rated for 230 V/230 V 50 Hz are connected as shown in figure. The readings on the ideal voltmeter when R = 0 and R = infinity respectively are
1
230 V, 230 V
2
115 V, 230 V
3
230 V, 115 V
4
115 V, 115 V