Which of the following statements are correct with respect to Dark Matter?
- Dark Matter emits no light and cannot be seen directly
- Dark Matters are stars or planets.
- Astronomers do not detect gamma rays produced by them.
- Dark matter is black hole.
Select the correct answer using the codes given below:
2, 3 and 4
1, 3 and 4
1 and 3
1, 2, 3 and 4