What does aural media type is used for ?
(a) For use with low-resolution teletypes, terminals, or other devices with limited display capabilities
(b) For use with Braille printers
(c) For use with speech synthesizers
(d) For use with projected media (direct computer-to-projector presentations), or printing transparencies for projection
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This intriguing question comes from Media Types topic in division CSS Text, Borders and Images of CSS