The correct answer is A. Data type.
A data type is a set of rules that define the type of data that can be stored in a field. For example, a field with a data type of “integer” can only store whole numbers, while a field with a data type of “string” can store any sequence of characters.
The field description is a brief explanation of the purpose of the field. It is not used to identify the type of information stored in the field.
The field name is the name of the field. It is used to identify the field in the database.
The field properties are additional settings that control the appearance and behavior of the field. They are not used to identify the type of information stored in the field.