While Designing a Document,which of the Following Should One Undertake

Multiple Choice

While designing a document,which of the following should one undertake to make a web page useful for visually impaired viewers?

A) Provide navigation bars vertically on the top of a screen
B) Use alternative text or "ALT tag" for web pages
C) Label hypertext links "Click here" so that users can navigate easily
D) Provide links that do not change color when visited
E) Place an off button if a document has music or sound effects