Answer:
Following are attached images that will help you understand the complete code. The code is tested with different variables and different outputs are obtained. All the necessary description is given in the form o comments inside the code.
Explanation:
 
        
             
        
        
        
Answer:
Answer is Mobile commerce
 
        
             
        
        
        
<span>The person or persons requesting the worksheet should supply their requirements in a requirements document. </span>
        
             
        
        
        
Here is an HTML example with the CSS class defined inline:
<!doctype html>
<html>
  <head>
    <style>
   .YellowBackground {
  background-color : yellow;
   }
 </style>
    
    </head>
  
    <body class="YellowBackground">
        <h1>A yellow background</h1>
    </body>
</html>
 
        
             
        
        
        
Goto settings>display>resolution what os is your system? this was for a win 10