Which sight type incorporates a notched rear sight with a bead?

The correct choice refers to open sights, which typically consist of a notch in the rear sight and a front sight that is often a bead or blade. This design enables the shooter to align the sights quickly and intuitively on their target. The notch allows the shooter to have a clear line of sight while the bead provides a point of reference for aiming effectively.

In contrast, telescopic sights utilize lenses to magnify the target, creating a more complex sighting system that doesn't include a bead and notch configuration. Aperture sights operate with a circular opening that focuses the eye on a target, while dot sights use a red or green dot as a point of aim, none of which resemble the simple design of open sights. Thus, the particular combination of a notched rear sight with a bead is characteristic of open sights, affirming their identification in this question.