Which of the following statements are correct about a HashTable collection?

1. It is a keyed collection.
2. It is a ordered collection.
3. It is an indexed collection.
4. It implements a IDictionaryEnumerator interface in its inner class.
5. The key - value pairs present in a HashTable can be accessed using the Keys and Values properties of the inner class that implements the IDictionaryEnumerator interface.

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.

1. Data
2. Class
3. Enum
4. Structure
5. Namespace

namespace CuriousTabConsoleApplication
{ 
    class SampleProgram
    { 
        static void Main(string[] args)
        { 
            int[]arr = newint[]{ 1, 2, 3, 4, 5 }; 
            fun(ref arr);
        }
        static void fun(ref int[] a)
        { 
            for (int i = 0; i < a.Length; i++)
            { 
                a[i] = a[i] * 5; 
                Console.Write(a[ i ] + " "); 
            } 
        } 
    } 
}

struct Emp
{
    public String name;
    public int age;
    public Single sal; 
}
Emp e = new Emp();

e.name = "Amol"; 
e.age = 25; 
e.sal = 5500;

With e
{
    .name = "Amol";
    .age = 25;
    .sal = 5500; 
}

With emp e
{
    .name = "Amol";
    .age = 25;
    .sal = 5500; 
}

e -> name = "Amol"; 
e -> age = 25;
e -> sal = 5500;

name = "Amol"; 
age = 25;
sal = 5500;