In the following DFS code snippet for counting paths summing to targetSum using prefix sums, which line is most likely to cause incorrect results due to improper handling of the prefix_counts map?

In the following DFS code snippet for counting paths summing to targetSum using prefix sums, which line is most likely to cause incorrect results due to improper handling of the prefix_counts map? ```python def dfs(node, current_sum): if not node: return current_sum += node.val result += prefix_counts.get(current_sum - targetSum, 0) prefix_counts[current_sum] = prefix_counts.get(current_sum, 0) + 1 dfs(node.left, current_sum) dfs(node.right, current_sum) prefix_counts[current_sum] = prefix_counts.get(current_sum, 0) - 1 ```