Who developed near-isothermal forging technology for aero-engines?

Who developed near-isothermal forging technology for aero-engines?

A. IRSO

B. DRDO

C. Skyroot

D. SpaceX

Explanation:

DRDO announced a modest step towards achieving the ultimate aeronautical challenge, one that even resource-rich China is struggling to achieve: Developing a jet engine with the thrust to power a fighter in combat.