Read this excerpt from A Black Hole Is NOT a Hole.

Certain things are invisible to us because our eyes just can't sense them. You don't see beams of infrared light shooting across the room from your remote control to the TV, for example, or radio waves streaming off everyone's cell phone.

Which statement best identifies the description in this excerpt?

The author gives examples of people who use cell phones.
The author describes different features of TV remote controls.
The author gives examples of things our eyes cannot see.
The author describes a feature of infrared light beams.