____________ types are mutually exclusive in the sense that a user agent can only support one media type when rendering a document.

Answer: Option C

Media types are mutually exclusive in the sense that a user agent can only support one media type when rendering a document. However, user agents may use different media types on different canvases. For example, a document may (simultaneously) be shown in ‘screen’ mode on one canvas and ‘print’ mode on another canvas.