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Interfaces

Q1:
Which of the following is the correct way to implement the interface given below? 
interface IPerson
{ 
    String FirstName
    {
        get;
        set; 
    } 
}

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

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

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

D None of the above

ANS:A - 

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

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