In this problem, let REF(x.i)→DEF(x.k) denote that the linker will associate an arbitrary reference to symbol x in module i to the definition of x in module k. For each example that follows, use this notation to indicate how the linker would resolve references to the multiply-defined symbol in each module. If there is a link-time error (rule 1), write “error”. If the linker arbitrarily chooses one of the definitions (rule 3), write “unknown”.

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A. /* Module 1 */ int main() { } (a) REF (main.1)→ DEF( (b) REF (main.2)→ DEF( B. /* Module 1 */ void main() { } (a) REF (main.1)→ DEF (_ (b) REF (main.2)→ DEF( C. /* Module 1 */ int x; void main() { } (a) REF (x.1)→ DEF(__ (b) REF(x.2)→ DEF(_ /* Module 2 */ int main; int p2() { } /* Module 2 */ int main= 1; int p2() { } /* Module 2 */ double x = 1.0; int p2() { }