A photo-realistic mosaic of the company’s sales force would look best...

JPEG would be the most appropriate format.

GIF is a highly compressed image format that can only show 256 colors, so it is not photorealistic.

CMYK is a color scheme, it's not an image format.

BMP (Bitmap) is an uncompressed image format that is not very efficient.

JPEG is a lossy image compression format that is generally appropriate for reproduction. Most digital cameras, for example, shoot in the JPEG format.
 
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