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What is extern variable?

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in Object Oriented Programming by (128k points)
What is extern variable?

(a) Variables to be used that are declared in another object file

(b) Variables to be used that are declared in another source file

(c) Variables to be used that are declared in another executable file

(d) Variables to be used that are declared in another program

This question was addressed to me in my homework.

My doubt is from Extern Variable in division Memory Allocation & Scope of Variable of Object Oriented Programming

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Best answer
Correct choice is (b) Variables to be used that are declared in another source file

Best explanation: The variables that are declared in another source file can be accessed in other files using extern variables. The extern variables must be mentioned explicitly. The source file is included to use its variables.

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