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

1. An enum can be declared inside a class.
2. An enum can take Single, Double or Decimal values.
3. An enum can be declared outside a class.
4. An enum can be declared inside/outside a namespace.
5. An object can be assigned to an enum variable.

enum color : int
{
    red = -3,
    green,
    blue 
}
Console.Write( (int) color.red + ", "); 
Console.Write( (int) color.green + ", "); 
Console.Write( (int) color.blue );

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.

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

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

1. Every enum is derived from an Object class.
2. Every enum is a value type.
3. There does not exist a way to print an element of an enum as a string.
4. Every enum is a reference type.
5. The default underlying datatype of an enum is int.