In the Checkerboard Karel program, what colors are used to paint the grid?

In the Checkerboard Karel program, the grid is typically painted in alternating colors to create a checkerboard pattern. The most common colors used for this pattern are black and white. This design is reminiscent of a classic checkerboard, which consists of squares of two contrasting colors. The program implements a loop that allows Karel to paint one square black and the adjacent square white, continuing this pattern across the entire grid.

Black and red, while they could potentially be used for some variations, do not accurately represent the traditional checkerboard pattern most commonly associated with this program. Therefore, the choice of black and white is the correct representation for painting a grid in this style, as it effectively creates the recognizable checkerboard effect.