Which of the model is largely an optimization in which the system finds values for the Hull-White volatility parameters sigma and reversion rate a, in which the option prices, calculated using the Hull-White model or BlackScholes model, match as far as possible?

Which of the model is largely an optimization in which the system finds values for the Hull-White volatility parameters sigma and reversion rate a, in which the option prices, calculated using the Hull-White model or BlackScholes model, match as far as possible?
A . Calibration of the Hull-White interest rate model
B . Purchase order
C . Delivery note number
D . Form-based document

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Answer: A