When a Java conditional expression is defined for a transform operation in a message map, which statement is true?

When a Java conditional expression is defined for a transform operation in a message map, which statement is true?
A. Java methods that use the DOM API cannot be used.
B. Only Java methods can be used with standard Java types.
C. Java methods that include MbElement data type arguments can be used.
D. The Java class provided to the map must have static methods that return Boolean values.

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