The function of a NOT logic gate is to

The correct answer is option 2) i.e. invert the input signal

CONCEPT:

• Logic gate: Logic gates are the basic building blocks of a digital system.
  • ​A logic gate works on the principle of a Boolean function which is a logical operation performed using one or more binary inputs that produce a single binary output.
  • The boolean function uses only two variables - zero or one.
  • The relationship between these inputs and the output is based on a certain logic. Based on this, logic gates are given names.
  • A few logic gates along with their symbol and truth table are as follows:

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EXPLANATION:

• The high and low inputs correspond to 1 and 0 respectively.
• In a NOT gate, a low output is obtained from a high input and vice versa.
• Therefore, as inferred from the truth table of the NOT gate, it inverts the input signal.