Which of the following is NOT a valid data type for extensible attributes?

• A. String
• B. Date
• C. Email
• D. Boolean

Answer: (D)

Extensible Attributes are additional fields you can attach to grid objects to store extra metadata, and each attribute has a data type that defines what kind of value it can hold. Among common data types you can use are textual strings, dates, and formatted values such as email addresses. There isn’t a dedicated boolean data type in the Extensible Attributes schema, so you can’t declare an attribute as true/false in boolean form. If you need to represent a true/false value, you’d store it as a string like "true"/"false" or as a numeric 1/0, depending on how you prefer to interpret the value. That’s why the option representing a boolean type is the one that isn’t a valid data type for extensible attributes.