Consider the following classes:
Expression represents algebraic expressions, including prefix, postfix, and infix expressions. Its public methods include characterAt. Its protected mediods include isOperator and isldentifier. It also has several private methods.
infixExpression is derived from Expression and represents infix expressions. Its public methods include isLegal and evaluate. It also has several protected and private methods.
a. What mediods can the implementation of isldentifier invoke?
b. What methods can the implementation of isLegal invoke?
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