The correct number line that has the integers 2, -6, and 0 plotted accurately is the first description:
"A horizontal number line. The line is numbered from -10 to 10 by increments of 1. The integers -6, 0, and 2 are each marked with a red dot."
In this description, -6 is to the left of 0, and 2 is to the right of 0, which correctly represents their positions on the number line.