Computer Science for IGCSE & O level - Data Representation (Section 8 - No. 17)

How is the inversion of bits achieved in the process of obtaining the two's complement of a binary number?

By adding 1 to each bit.

By subtracting 1 from each bit.

By changing each 0 to 1 and each 1 to 0.

By multiplying each bit by -1.

Inversion of bits means flipping 0s to 1s and 1s to 0s.