Which of the following statements is correct about the C#.NET code snippet given below?

enum color : byte
{
    red = 500,
    green = 1000,
    blue = 1500
}

String s1="Kicit";
Console.Write(s1.IndexOf('c') + " "); 
Console.Write(s1.Length);

String s1 = "ALL MEN ARE CREATED EQUAL";
String s2;
s2 = s1.Substring(12, 3); 
Console.WriteLine(s2);

1. Single f = 9.8f; 
   String s;
   s = (String) (f);

2. Single f = 9.8f; 
   String s;
   s = Convert.ToString(f);

3. Single f = 9.8f; 
   String s;
   s = f.ToString();

4. Single f = 9.8f; 
   String s;
   s = Clnt(f);

5. Single f = 9.8f; 
   String s;
   s = CString(f);

1. String is a value type.
2. String literals can contain any character literal including escape sequences.
3. The equality operators are defined to compare the values of string objects as well as references.
4. Attempting to access a character that is outside the bounds of the string results in an IndexOutOfRangeException.
5. The contents of a string object can be changed after the object is created.

enum per
{
    married, 
    unmarried, 
    divorced, 
    spinster
}
per.married = 10; 
Console.WriteLine(per.unmarried);

enum color
{
    red,
    green,
    blue 
}
color c; 
c = color.red; 
Console.WriteLine(c);

enum color
{
    red,
    green,
    blue 
}
color c = color.red;
Type t;
t = c.GetType();
string[ ]str;
str = Enum.GetNames(t);
Console.WriteLine(str[ 0 ]);

enum color: int
{ 
    red,
    green, 
    blue = 5, 
    cyan,
    magenta = 10, 
    yellow 
}
Console.Write( (int) color.green + ", " ); 
Console.Write( (int) color.yellow );

1. To use the keyword enum, we should either use [enum] or System.Enum.
2. enum is a keyword.
3. Enum is class declared in System.Type namespace.
4. Enum is a class declared in the current project's root namespace.
5. Enum is a class declared in System namespace.