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Which of the following is the correct way to implement a read only property Length in a Sample class?

 class Sample
 {    
     int len;  
     public int Length  
     {       
            get      
            {        
               return len;   
            }    
        }   
    }

class Sample 
{  
       public int Length   
       {       
            get      
            {            
                return Length;    
            }     
      } 
  }

   class Sample
   {  
         int len;  
         public int Length   
         {        
                get      
                {            
                    return len;         
                }          
                set         
                {         
                    len = value;   
                }    
            }  
        }

 class Sample
 {    
       int len;  
       public int Length    
       {       
           Readonly get      
           {             
                return len;        
           }   
       } 
   }

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