The correct answer is A. Q will flip from 0 to 1.
An RS flip-flop is a type of bistable multivibrator, a device with two stable states, which can be used to store one bit of information. The two states are represented by the binary digits 0 and 1. The output of the flip-flop is Q, and the input is S.
When both inputs are set to 0, the flip-flop is in the reset state, and the output is 0. If a momentary ‘1’ is applied at the input S, the flip-flop will go to the set state, and the output will flip from 0 to 1. If the input S is then returned to 0, the flip-flop will remain in the set state, and the output will remain at 1.
The other options are incorrect because they do not describe the correct behavior of the RS flip-flop.