Q. What will be the output of the following JavaScript code?

    <script>  
      
    var article = {  
                  "main title": "How to learn JavaScript",   
                  'sub-title': "The Definitive Guide",   
                  "for": "all audiences",   
                  author: {   
    firstname: "Scott",   
                             surname: "McCall"   
                          }  
               }  
    </script>  

• (A) Properties
• (B) property values
• (C) property names
• (D) objects