What will you use to achieve the following benefits? 1.Web site managers and authors may share style sheets across a number of documents (and sites). 2.An author may change the style sheet without…

What will you use to achieve the following benefits? 1.Web site managers and authors may share style sheets across a number of documents (and sites). 2.An author may change the style sheet without requiring modifications to the document. 3.A user agent may load style sheets selectively (based on media descriptions).