Which of the following are characteristics of CRT monitors?

CRT (Cathode Ray Tube) monitors are indeed characterized by the use of an electron beam that strikes phosphor dots on the inside of the screen. This process creates images by lighting up the phosphor dots in various colors to form pixels. The electron gun within the CRT emits beams of electrons that are directed towards the phosphors on the screen, resulting in the display of images.

In contrast, CRT monitors are typically much heavier and bulkier than their modern counterparts, such as LCD or LED monitors, which explains why the lightweight and portable design is not a characteristic of CRT technology.

Additionally, CRT monitors traditionally operated in a 4:3 aspect ratio and did not commonly support widescreen formats, which are now standard in most modern displays. Moreover, while CRTs are capable of displaying multiple resolutions effectively, they often excel at multiple resolutions due to their analog nature, which is another reason that option regarding inability to display multiple resolutions does not apply here.