C. addtoken appends client identification information within the query string of the redirected page. These may be set as cookies too, but not necessarily so.
A2:
B and C. <cfheader> is used on the server side to alter response headers. The response header is sent to the browser and can tell it not to cache a page.
A3:
B. The first character after the quotation mark is a forward slash (/), so a ColdFusion mapping is used.
A4:
D. reset="Yes" clears any display before the tag, so ABC is not shown.
