The correct answer is A. Autonumber.
An Autonumber data type is a field that automatically generates a unique number for each record in a table. This number is used to identify the record and can be used in queries and reports.
A Memo data type is a field that can store a large amount of text. This text can be formatted with bold, italics, and underline, and can include hyperlinks.
A Number data type is a field that stores numeric values. These values can be integers, decimals, or currency values.
A Text data type is a field that stores text. This text can be up to 255 characters long.
Here is an example of how an Autonumber field is used:
| ID | Name |
|---|---|
| 1 | John Smith |
| 2 | Jane Doe |
| 3 | Mary Johnson |
In this example, the ID field is an Autonumber field. The ID field is used to identify each record in the table. The Name field is a Text field that stores the name of the person.
I hope this helps! Let me know if you have any other questions.