Read the passage below carefully, and then choose the best answer:
Background, in relation to computers, on the screen, the color on which characters are displaye _______, a white background may be used for black characters. In a windowing environment in which more than one program or document can be available to the user, open but currently inactive _______ are said to be in the backgroun.
For example/ windows For sure/systems In fact/tasks In general/characters