1. Which of the following conditions should be satisfied to call an astable multivibrator circuit using discrete components as a digital circuit? A flip-flop is always a digital circuit. Only when we assign 1 and 0 to the high and low levels of the output, a flip-flop is called a digital circuit. Only if the power, supply voltage is maintained at + 5 V or - 5 V, it is called a digital circuit. Only if it is in IC form, following the technology of IC manufacture, it is called a digital circuit.Select the correct answer from the codes given below: