In the source-code file containing a class’s member function definitions, each member function definition must be tied to the class definition by preceding the member function name with the class name and ::, which is known as the:

Binary Scope Resolution Operator

Explanation:

The :: (scope resolution) operator is used to get hidden names due to variable scopes so that you can still use them. The scope resolution operator can be used as both unary and binary. Fortunately, in this context we're not dealing with hidden contents; thus the Binary applies better than the Unary.

Cheers

b for sure (if your smart try and answer my recent math question lol and b sounds lit

(a) oldest