NRZ is the acronym for which of the following?

NRZ (Non-return to zero) is a digital encoding method in which a logic 1 is represented by one voltage level and a logic 0 by another, with the signal holding its value for the full bit period without transitioning back to a zero-volt baseline. This distinguishes it from RZ (return-to-zero) encoding, where the signal resets mid-bit. NRZ and its variants (NRZ-L, NRZ-I) are widely used in serial interfaces, optical fiber transmission, and storage systems.

'Nominal return zone' is not a recognized term in digital signal encoding, line coding standards, or networking technology.

'Network registration zone' has no definition in digital communications or signal encoding and is unrelated to line coding methodology.

'Normal return zone' is not a defined term in any networking, telecommunications, or digital signal processing standard.