Question: What is the output of the program below when compiled using: gcc main.c func.c main.cfunc.c extern int x; extern int y; extern int z; void

What is the output of the program below when compiled using:
gcc main.c func.c
main.cfunc.c
extern int x; extern int y; extern int z; void func(){x = x + y; y =4+ z; z = x + y; }
Group of answer choices
4
20
6
3
Undefined behavior
13

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