Which masking technique is NOT available with the Data Masking transformation?

The correct answer identifies the technique that is not part of the Data Masking transformation offerings. In this instance, obfuscation masking is not included among the standard techniques provided by Informatica's Data Masking transformation.

Data masking generally involves methods that allow for the replacement or alteration of sensitive information while maintaining its usability for testing or analytical purposes. Substitution masking, random masking, and key masking are well-established methods within data masking practice.

Substitution masking replaces original data values with fictional but realistic alternatives, while random masking alters data by providing random values within defined parameters. Key masking involves using keys to transform data in a reversible manner, which ensures that the original data can be restored given the right key.

Obfuscation masking, on the other hand, typically refers to a broader concept that may involve techniques to make data unreadable or unintelligible without necessarily following the specific protocols of data masking as defined in Informatica’s transformation methods. Hence, it does not constitute a formal technique offered within their Data Masking transformation. This distinction clarifies why obfuscation masking stands apart from the other options listed.