Which one of the following acronyms is matched incorrectly with its full form?

PNG actually stands for Portable Network Graphics, so pairing it with Portable Nested Graphics is the wrong match.

GIF is correctly expanded as Graphics Interchange Format, a format for simple images and animations.

CSV is correctly expanded as Comma Separated Values, a plain text format for tabular data.

MIDI is correctly expanded as Musical Instrument Digital Interface, a standard for electronic music devices.

PNG is a lossless image format that also supports transparency, widely used on the web.

The task is to spot the single mismatched expansion, which is the one attached to PNG.