Answer:
I think it would be the 3rd or 4th one.
General relativity is a theory of space and time. The theory was published by Albert Einstein in 1915. The central idea of general relativity is that space and time are two aspects of spacetime. Spacetime is curved when there is gravity, matter, energy, and momentum.
Goggles, a lab coat, chemical gloves, and close- toed shoes
I added individual steps for clarity. Note that g must be positive if the solution is to be real.
Let me know if you have any questions.