How Do Astronomers Save Their Eyes When Looking at the Sun

Multiple Choice

How do astronomers save their eyes when looking at the Sun through a telescope?

A) They use heavy filters to block out light, particularly at specific wavelengths.
B) They use a special water cooled camera system to avoid superheating the camera.
C) They project the telescope image onto a large screen or record the image with a camera.
D) They look at the image very quickly.