[Year 12 IT Apps] Data type for postcode

[Athena Spyratos]

Fellow IT teachers.
Do we declare the data type for Postcode as number or text? In database, if we apply a validation rule for a Victorian postcode as being between 3000 and 3999, then we declare it as a number. However going over one of the past exam multiple choice questions, the answer they wanted for the data type for Postcode was text. Which answer are the examiners looking for?
Athena
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