Which describes Einstein's second postulate about the special theory of relativity?
1. The speed of light in a vacuum is constant, and nothing is faster than the speed of light.
2. The speed of light in a vacuum is constant, and some things are faster than the speed of light.
3. The speed of light in a vacuum fluctuates, but nothing is faster than the speed of light.
4. The speed of light in a vacuum fluctuates, and some things are faster than the speed of light.
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