Write the next sentence in this paragraph:

How to void a check
Get a pen.
Don't use a pencil, since someone could come along and " unvoid " your check by erasing your marks. Use black or blue markers.

OPT:
[I] The most important thing is to be sure that it cannot be erased or obscured in any way. Write " void " across the payee line.;
[II] Pen erasers are much less effective at erasing than pencils due to the extra ink in the pen. Just use a pencil scraper to avoid picking up ink every time you wipe off your stamp.;
[III] Scratch out the blank line in the check. Use caution when rubbing the blank line as the ink can streak.;
[IV] Get something that will serve as a watermark, like a marker. A pencil with a dark blue edge will give you a rough approximation of your mark-if the only writing tool you use at home is pencil, try white or other dark colored markers.;
[I]