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; } } }
• None of the above