There's no way to tell since we don't know enough about the hardware and such. But right now, it's pretty much the most advanced system operational anywhere today. NATO is yet to make an equivalent, they are still using Link 16 and 22, which was made back in the 80s. Russia and China are also yet to move up the chain.
2. What is operative and cooperative system?
Based on the picture, operative means multiple systems working together as a single unit, perhaps dependent on each other, a family of systems. Whereas cooperative systems are those which are completely autonomous, which means they can perform their duties on their own, like an operative system, but have to work together as a team, cooperate, in order to be effective.
It's really an advertisement for "family of systems". So a fighter jet is an operative system. But in the future, the fighter jet will act together with drones and SAMs as a single unit thereby expanding the concept of an operative system. Which means they will make decisions as a single unit, including firing off weapons without any direct contact with the weapons. For example, fighter pilots will be able to use the weapon loads of drones and SAMs no different from their own weapons. It's basically CEC, but across the entire force. And it goes further than that in terms of tactics since there's only one decision maker for multiple systems.
3. How IFF will be performed?
The usual. Send a burst of information out called an interrogation signal, and if there is a response and it matches with the database you have, then it's friendly, otherwise it's a UFO and requires further validation. Using Mode 5/S IFF, we already have hardware that allows identification of targets without having to duplicate the effort in a busy radar environment. It means multiple radars watching the same airspace won't send out IFF individually for the same target, only one radar will send it out and then inform the other radars about it.
There must be ground system which will ride on AFnet just like IACCS am I right.
AFNET is the communication backbone, it's basically the IAF's personal Internet or even intranet. IACCS consists of the hardware and applications that ride AFNET, no different from how this forum rides the Internet.