The system of rules and structure which governs language is generally referred to as: C. grammar.
<h3>What is language?</h3>
A language simply refers to a structured system of communication through which living organisms, especially humans share information among themselves, especially through the use of spoken words and sounds.
In English language, grammar is the system of rules and structure which governs the use and composition of language.
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Answer: Scope resolution operator(::)
Explanation: A member function and the constructor can be called within the function easily but for the execution of the these components outside the class , a special operator is required to call the functions. The scope resolution operator(::) preceding with the name of class is thus used for defining of the function outside class.This operator maintains the cope of the function and constructor outside the class.