AccessSpecifier Defaults

	Default	Permitted declared accessibilities
namespace	public	none (always implicitly public)
enum	public	none (always implicitly public)
interface	public	none
class	private	All¹
struct	private	public, internal, private²
delegate	private	All¹
constructor	protected	All¹
interface member	public	none (always implicitly public)
method	private	All¹
field	private	All¹
user-defined operator	none	public (must be declared public)

¹ All === public, protected, internal, private, protected internal

² structs cannot inherit from structs or classes (although they can, interfaces), hence protected is not a valid modifier