In linux, argv[0] by command-line argument can be occupied

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In linux, argv[0] by command-line argument can be occupied by _________.

1. ./test
2. ./fun.out.out
3. ./a.out
4. All of above
5. None of these

Correct Option: D

In linux, argv[0] by command-line argument can be occupied by ./test, ./fun.out.out and ./a.out