To answer this question, we need to understand the different record field properties that can be set to validate dates.

Option A) Setting %Date as constant - This option is incorrect because setting %Date as a constant does not validate dates for less than or greater than 30 days. It only sets a constant value for the %Date field.

Option B) Required - This option is incorrect because setting a field as required does not specifically validate dates for less than or greater than 30 days. It only ensures that a value is entered for the field.

Option C) Specifying Default using Record and Field values - This option is incorrect because specifying a default value using record and field values does not validate dates for less than or greater than 30 days. It only sets a default value for the field.

Option D) Reasonable date - This option is correct. The "Reasonable date" property can be set to validate dates for less than or greater than 30 days. It allows you to define a range of reasonable dates and ensures that the entered date falls within that range.

Option E) Validate date - This option is incorrect because the "Validate date" property only validates the format of the entered date, such as ensuring that it is in the correct format (e.g., mm/dd/yyyy).

The correct answer is D) Reasonable date. This option is correct because it allows you to validate dates for less than or greater than 30 days by defining a range of reasonable dates.

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