India has no military options vis-a-vis China apart from the suicidal use of nuclear weapons.
US > China >> India.
The Chinese are actually closer to the US in overall strength than the Indians are to the Chinese.
This relative Chinese power advantage will only increase in the next 2 decades.
Only if you look at paperspecs and not on realistic tactical scenarios in case of a war. The fact is, Chinese foces could never afford to use all their assets against India and leave the waaaay more important borders and cities in the east without protection. The Tibet area is not the priority for China, it's east Asia and that's where Chinese forces will always remain with their focus!
IA has around 1 mio active personal, split them in half for both borders, PLA has around 2 mios activer personal, but would hardly field 1/4 or 1/3 of them against us and to keep the US and allies in check in the east.
So it would be 500 000 vs 500 000 to 666 666, not that big difference don't you think? And the same is the case for their air force fleet as well.
An other problem for Chinese forces is the huge distances between eastern and western borders, which makes it difficult for them to simply move troops or supplies around and as fast as possible. India is a big country too, but not compared to China and that gives advantages for our forces as too.
For Indias military options, it's once to build up ground forces and air defence on our eastern borders in a similar manner as PLA is doing it, just like IAF has to build up air strips and modernise it's fleet to counter and strike targets in the Tibet area. With the long term perspective of pose a nuclear threat to Chinese eastern costlines, be it with long range balistic missiles, or SSBNs.
So there are certain options that Indian forces are building up right now, not only to defend our borders, but to have credible deterrence against China, be it in a conventional or nuclear war.