A Solar Telescope Would Quickly Incinerate Your Eyes,so How Do

A solar telescope would quickly incinerate your eyes,so how do astronomers save their eyes when looking at the Sun?

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