Q. The phenomenon of "Red shift" observed in distant galaxies has been used as evidence for which of the following?

1. Expansion of the universe
2. Existence of Black holes
3. Existence of Dark Energy

Select the correct option from the codes given below:
Answer: Only 1 & 3
Notes: Redshift indicates light sources moving away from the observer, which supports the expansion of the universe. It also serves as evidence for dark energy due to accelerating expansion. The existence of black holes is inferred from gravitational effects and X-ray emissions, not from redshift observations.