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What is the scope of an external variable?

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What is the scope of an external variable?

(a) Whole source file in which it is defined

(b) From the point of declaration to the end of the file in which it is defined

(c) Any source file in a program

(d) From the point of declaration to the end of the file being compiled

This question was addressed to me by my school teacher while I was bunking the class.

Enquiry is from Scope of a Variable topic in section C Functions and Structure of a Program of C

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The correct option is (d) From the point of declaration to the end of the file being compiled

For explanation: None.

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