Which keyword is used to make a nonmember function as friend function of a class?

Which keyword is used to make a nonmember function as friend function of a class? Correct Answer friend

The keyword friend is provided in programming languages to use it whenever a functions is to be made friend of one class or other. The keyword indicates that the function is capable of new functionalities like accessing private members.
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4. Attempting to instantiate an abstract class results in an error.
Making class members inaccessible to nonmember functions is an example of
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As a nonmember who can participate in the proceedings of either House of the Parliament?
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