Assuming Pakistan strikes India first with the nuclear attack order coming from Rawalpindi, how will India respond?

Would India prioritize targeting Rawalpindi-Islamabad metro, which is where the GHQ, ISI, and the Pakistani military are headquartered?

After all that is where the attack order came from.

It would be a shame if the Pakistani generals who ordered a nuclear attack on India go unpunished. They should be hunted down because they have a nuclear first use policy.