What is the difference between access specifier protected and internal protected in C#

Question

What is the difference between access specifier protected and internal protected in C# ?

Answer 1

Internal can be seen within the assembly.

Protected can be seen by classes inheriting from the class where it is defined.

Protected internal can be seen within the assembly OR types derived from the class where it is defined (including types from other assemblies).

See: http://msdn.microsoft.com/en-us/library/ba0a1yw2.aspx

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public              Access is not restricted.
protected           Access is limited to the containing class or types derived from the containing class.
internal            Access is limited to the current assembly.
protected internal  Access is limited to the current assembly or types derived from the containing class.
private             Access is limited to the containing type.