Tom Is Making Changes to His Company's Web Site

Multiple Choice

Tom is making changes to his company's Web site. Because he likes the way the markup is styled, he copies the following into another section of the page: <div id="subsection"> This section is under construction</div> Why does the home page not validate properly?

A) Element attributes must be declared in the style sheet.
B) The <div> tag was not closed properly.
C) A <div> tag can be used only once in each document's markup.
D) An ID attribute can be applied to only one element in a document.