While mixing a strong concentrated acid/base, we must take care of which of the following?

Q. While mixing a strong concentrated acid/base, we must take care of which of the following?

1. The acid/base must always be added slowly to water rather than the other way around.

2. We must stir the solution slowly and constantly. 3. Protective goggles, gloves, and a lab coat should be worn. 4. The water must always be added to the acid/base rather than the other way around.

1. Only 1 and 3 are correct
2. Only 1, 2 and 3 are correct
3. Only 2, 3 and 4 are correct
4. None of the above

Answer: Only 1, 2 and 3 are correct