Which of the following statements are correct about an interface in C#.NET?

1. A class can implement multiple interfaces.
2. Structures cannot inherit a class but can implement an interface.
3. In C#.NET, : is used to signify that a class member implements a specific interface.
4. An interface can implement multiple classes.
5. The static attribute can be used with a method that implements an interface declaration.

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; 
        } 
    } 
}

interface IMyInterface
{ 
    double MyFun(Single i);
}

class MyClass
{
    double MyFun(Single i) as IMyInterface.MyFun
    {
        // Some code
    }
}

class MyClass 
{
    MyFun (Single i) As Double
    {
        // Some code
    } 
}

class MyClass: implements IMyInterface
{
    double fun(Single si) implements IMyInterface.MyFun()
    {
        //Some code
    } 
}

class MyClass: IMyInterface
{
    double IMyInterface.MyFun(Single i)
    {
        // Some code
    } 
}

interface IMyInterface 
{
    void fun1(); 
    void fun2();
}
class MyClass: IMyInterface
{ 
    private int i; 
    void IMyInterface.fun1()
    { 
        // Some code
    } 
}

    delegate void del(int i);

1. On declaring the delegate a class called del will get created.
2. The signature of del need not be same as the signature of the method that we intend to call using it.
3. The del class will be derived from the MulticastDelegate class.
4. The method that can be called using del should not be a static method.
5. The del class will contain a one-argument constructor and an lnvoke() method.

1. Remoting
2. Serialization
3. File Input/Output
4. Multithreading
5. Event handling

class Sample
{
    public void MyFun(int i, Single j)
    {
        Console.WriteLine("Welcome to CuriousTab !");
    }
}

delegate void del(int i);
Sample s = new Sample();
del d = new del(ref s.MyFun);
d(10, 1.1f);

delegate void del(int i, Single j);
del d;
Sample s = new Sample();
d = new del(ref s.MyFun);
d(10, 1.1f);

Sample s = new Sample();
delegate void d = new del(ref MyFun);
d(10, 1.1f);

delegate void del(int i, Single]);
Sample s = new Sample();
del = new delegate(ref MyFun);
del(10, 1.1f);