What is the purpose of the Sticky Keys feature in x?

A.
To assist users who have difficulty holding down multiple keys at once

B.
To prevent repeated input of a single character if the key is held down

C.
To ignore brief keystrokes according to a specified time limit

D.
To repeat the input of a single character

Explanation/Reference:
From wikipedia:
StickyKeys is an accessibility feature to aid users who have physical disabilities. It essentially serializes keystrokes instead of pressing multiple keys at a time: StickyKeys allows the user to press a modifier key, such as Shift, Ctrl, Alt, or the Windows key, and have it remain active until another key is pressed.