What sound does "sulponticello" create when playing?

Sulponticello refers to a technique used by string players where they bow the strings near the bridge of the instrument rather than over the fingerboard. This technique produces a distinctive sound that is characterized by its grating, harsh quality, which is often described as edgy or biting. The proximity to the bridge emphasizes the upper harmonics of the strings, leading to a sound that is less warm and full-bodied compared to other playing techniques, such as sul ponte (over the fingerboard).

In the context of string performance, this technique is utilized to create special effects or to evoke certain emotions in the music. Thus, the choice that highlights the "grating sound close to the bridge" accurately describes the sonic characteristics produced by sulponticello, making it clearly the correct answer.