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Which of the following is the correct way to implement the interface given below?

interface IPerson 
{    
      String FirstName  
      {      
          get;     
          set;     
     }
  }

class Employee : IPerson 
{   
    private String str;  
    public String FirstName   
    {        
         get      
         {           
             return str;      
         }       
         set       
         {           
             str = value; 
         }   
      } 
   }

 class Employee
 {   
     private String str;   
     public String IPerson.FirstName   
     {         
        get      
        {            
            return str;       
        }       
        set        
        {             
            str = value;   
        }    
    }  
 }

 class Employee : implements IPerson
 {  
     private String str;   
     public String FirstName   
     {       
          get       
          {           
             return str;      
          }
          set    
          {          
             str = value;    
          }   
       } 
    }