The speed of light in vacuum depends on,

1)wavelength
2)frequency
3)intensity
4)temperature
5)none of the above

I know that 1 and 2 are correct. What about the others?

3 answers

Huh ?
Please Google speed of light in a vacuum.
typo: * 1 and 2 are incorrect

Actually I was expecting a simpler explanation than what I've found on them already. :-)
Well the speed of light changes when passing through material, like air or water or glass, but not in a vacuum. What does temperature mean in a vacuum?
Something really, really massive nearby can have an effect (Einstein, relativity, gravitational lens)