Which of the given statement is correct in the context of visualising DNA molecules separated by agarose gel electrophoresis?
| 1. | DNA can be seen in visible light. |
| 2. | DNA can be seen without staining in visible light. |
| 3. | Ethidium bromide stained DNA can be seen in visible light |
| 4. | Ethidium bromide stained DNA can be seen under exposure to UV light. |
