Select from following answers:- Ram, Shyam, Jadhu, Madhu
- NULL

- Two rows.First row with Ram, Shyam, Jadhu, Madhu and second row with NULL
- Two rows.First row with Madhu,Jadhu,Shyam,Ram and second row with NULL
- All Above
Since all are strings, so the result will be the concatenation of all those rows i.e. Ram, Shyam, Jadhu, Madhu. However, finally we are concatenating the value with NULL which will be NULL
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