Future and option loss

if you are filing ITR-4, then you need to show 6 or 8% profit, as the the case may be. There is no compulsion to show loss. And if you are showing presumptive profit, there is no need for any audit anyway.

In case you choose to show actual loss, you need to file ITR-3. Audit won't apply in this case though. 

yes. if you wish to use the provisions of 44AD. but the profit percentage can be 6% as it is all digital transactions. 

You can opt for presumptive taxation for your regular business under Section 44AD, and separately declare a loss for futures and options (F&O) transactions by preparing a Profit & Loss statement and Balance Sheet. This approach does not necessitate a tax audit.