Question: The author of this method forgot to include the data type. Which of the following reference types can best fill in the blank to complete

The author of this method forgot to include the data type. Which of the following reference types can best fill in the blank to complete this method? 

public static void secret(. char ch mystery.charAt (3); mystery mystery.insert(1, "more"); mystery.length();

A. String 

B. StringBuilder 

C. Both 

D. Neither

public static void secret(. char ch mystery.charAt (3); mystery mystery.insert(1, "more"); mystery.length(); int num = } = mystery) {

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