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Which of these methods is used for finding the average time derivative in MacCormack’s technique?

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Which of these methods is used for finding the average time derivative in MacCormack’s technique?

(a) Trial and error method

(b) Predictor-corrector method

(c) Genetic algorithm

(d) Relaxation method

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I'd like to ask this question from Finite Difference Methods topic in portion Finite Difference Methods of Computational Fluid Dynamics

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Right choice is (b) Predictor-corrector method

The best I can explain: To get the time derivative at the average time between t and t+Δ t, the MacCormack’s technique uses the Predictor-corrector method. This is used as we do not know the value for the time derivative at the time-step t+Δ t.

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