Which itr for salary + speculation income

Hello experts,

I'm a salaried employee and have income from salary and some savings account interest.
In addition, I've done some investment in shares and my statement shows 2 sections:

(a) Short term capital gain & (b) Speculation Income.
STT is paid for both of these.

Question: Which ITR should I file (ITR-2 or ITR-4)? If ITR-2, then does Speculation income go under income from other sources and taxed as per my tax slab or since STT is paid, does it qualify under STCG?

I've no study done yet on ITR-4 as to which sections I'll have to file these incomes, if ITR-4 is the appropriate form? 

Thanks and regards,
Mr. Joshi