A user, Ann, is experiencing headaches and motion sickness symptoms when using her new computer monitor. Which of the following can a technician adjust to help Ann?

A privacy filter reduces viewing angles and brightness but does not address flicker or motion perception issues that cause headaches.

Refresh rate determines how many times per second the display redraws the image. A low refresh rate (such as 60 Hz or below) can produce visible flicker that the human visual system detects subconsciously, leading to eye strain, headaches, and nausea similar to motion sickness. Increasing the refresh rate (e.g., to 75 Hz or higher) reduces flicker and alleviates these symptoms.

Switching to a digital signal (e.g., from VGA to HDMI/DisplayPort) improves signal quality but does not directly control the refresh rate causing the symptoms.

Adjusting brightness affects eye fatigue from glare but does not address the flickering caused by a low refresh rate.