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Interfaces - Programming

Q1:

Which of the following is the correct implementation of the interface given below? 
interface IMyInterface
{ 
    double MyFun(Single i);
}

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

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

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

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

ANS:A - 

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

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