You can rename a chart sheet like any other worksheet. Right-click its sheet tab, and then click ____ on the shortcut menu.

In the accompanying figure, the black areas indicate the ____________________ areas in the layer mask.

Fill in the blank(s) with the appropriate word(s).

All of the following will reduce the exposure to computer viruses except

A. install antivirus software B. install factory-sealed application software C. assign and control user passwords D. install public-domain software from reputable bulletin boards