Which describes Einstein’s second postulate about the special theory of relativity?
A
The speed of light in a vacuum is constant, and nothing is faster than the speed of light.B
The speed of light in a vacuum is constant, and some things are faster than the speed of light.C
The speed of light in a vacuum fluctuates, but nothing is faster than the speed of light.D
The speed of light in a vacuum fluctuates, and some things are faster than the speed of light.