FNO income

If it is single trade or so, yes...

But advisable to file ITR 4 in such case... (provided no capital gains declaration)

File ITR 4 or 3 as per applicability...

Futures and options are treated as business income. Hence you are required to show it under Income from business and Profession. In this case you have to file your ITR-3 as you have salary income as well as Business income.

Hope this clarifies your doubt.