Operating systems, such as Microsoft Windows, are examples of ____________________, which works behind the scenes to help a computer keep tabs on itself in order to function efficiently.

What is the result of the following code? Assume that there is no text in display- JTextArea when this code begins executing.

``` 1 int y; 2 int x = 1; 3 4 do { 5 y = x * x; 6 displayJTextArea.append( y + "\n" ); 7 x += 1; 8 } while ( x <= 10 ); ```

Draw the ____ adjustment handle on a shape to change its proportions without changing the size of the shape.

A. red B. green C. blue D. yellow