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What is the extern "C" construct used for? Check all that apply.
So that functions compiled by the C compiler can be called from a program written in C ++
There is no such construction in C ++
So that functions compiled by the C ++ compiler can be called from a program written in C.
This construction is similar to the usual extern specifier (without "C") and is needed only for backward compatibility with old C ++ standards
So that the methods of C++ classes can be accessed from programs written in C
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