Which of the Following Statements Is True of Ester Hydrolysis

Which of the following statements is true of ester hydrolysis?

A) Both an acid and a base can act as the true catalysts of the reaction.
B) Neither an acid nor a base is the true catalyst of the reaction.
C) An acid is a true catalyst, but a base is a reagent and must be present in the appropriate stoichiometric amount.
D) A base is a true catalyst, but an acid is a reagent and must be present in the appropriate stoichiometric amount.