Which one of the following is *not* a vector image format ?

Which one of the following is *not* a vector image format ?

CGM
PNG
SVG
SWF
This question was previously asked in
UPSC CISF-AC-EXE – 2020
PNG (Portable Network Graphics) is a raster image format, meaning it represents images as a grid of pixels.
Vector image formats use mathematical equations to describe shapes, lines, and curves, making them scalable without loss of quality. Raster formats store images as a fixed grid of pixels, which can lose quality when scaled.
CGM (Computer Graphics Metafile), SVG (Scalable Vector Graphics), and SWF (Shockwave Flash, often used for vector animations) are examples of vector image formats. Other common raster formats include JPEG, GIF, and BMP.