a) x-derivative is treated implicitly
b) y-derivative is treated implicitly
c) Time derivative is treated implicitly
d) Thomas algorithm is not used
Answer: a
Explanation: In the first step with the time interval \(\frac{\Delta t}{2}\), the spatial derivatives are replaced using the central difference scheme. Only the x-derivative is treated implicitly. Then the resulting equations are solved using the TDMA method.
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