Answer:
 A WAN can be one large network or can consist of two or more lans connected together. The Internet is the world's largest wan.
Explanation:
 
        
             
        
        
        
Explanation:
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Answer: Child element
Explanation:
  According to the question, terry building the web site and she wants to create the three main types of links in the home page such as home, contact us and the product information. The, she start creating the hierarchy of elements in the page and also revise all the styles in the sheet.
 Then, the home page contain the two child element as it s the sub elements of the home page. As, the one element which is inherited from the upper element ( Parent ) is known as child element. This is the hierarchy of the elements which represented in the home page.  
 
        
             
        
        
        
Answer:
c. Book and Periodical are subclasses of LoanableItem
Explanation:
Books are kept in library in a periodical manner. Both classes are not superior, they are subclasses of LoanableItem. Library uses common guide which makes it easy to find a book.