a) second-order and first-order
b) first-order and second-order
c) second-order and second-order
d) second-order and third-order
Answer: c
Explanation: The truncation errors of the ADI scheme in the x and the y-directions are O(Δx2) and O(Δy2). Therefore, the order of accuracy of the ADI scheme in the x and the y-directions are two and two respectively.
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