Option from old tax system to to New system.

Yes you can

Yes, ...of course
u can choose old or new as per your choice to minimise tax burden.

Form 16 shows old tax system but whereas new tax is more beneficial.

Than you can file return under new system for that year.

u also can declare to your employer to deduct TDS as per new system only via declaration for current year, if it's beneficial

Once option given to employer for deduction of tax can be changed while filing itr?

Yes, you can choose as per your convenience while filing ITR.

Thanks

Yes option can be given

Sourav again you are replying twice the same answer just for getting points on CAClubindia.

Please respect this reputed profession and stop making fun of public platform.

Sourav you are replying twice the same answer just for getting points or 250/- reward on CAClubindia.

what is sense of yes or no, just for point..

Please respect this reputed profession and stop making fun of public platform.

It's already told by reputed member to you that stop replying without any base just for points

If you are not Stop this, I have to make complaint to block your account.