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Static member of the class can be accessible by other member of the class...

internal...

Internal linkage since accessible by other class members.

static member of a class in c++ default to internal linkage.
while static members in c default to external linkage.
( as said in Bruce Eckel )

External linkage. The static members are declared in scope of the class but defined outside of the class. They are not actually part of the class and can be accessed like this ClassName::static_variable

Static data members are not part of objects of a given class type; they are separate objects. As a result, the declaration of a static data member is not considered a definition. The data member is declared in class scope, but definition is performed at file scope. These static members have external linkage.

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