Betty wants to create an algorithm to help the NASA robot get from the lower right corner to the top-left square marked with a X. However, it cannot step on the red tiles, as they represent a lava river.

Which of these algorithms could she use?

Algorithm 1: Walk 4 squares up and 4 squares left.

Algorithm 2: Walk 2 squares up and 4 squares left and 2 squares up.

Algorithm 3: Walk 2 squares left and 4 squares up and 2 squares left.

Algorithm 4: Walk 4 squares left and 4 squares up.

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