This is more a question for Brainly,
2 answers:
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Answer:
Record number
Explanation:
It simply can't be "data type" as there cant be more than one data type in a field. It won't be "primary key field" either as primary keys only set the field as unique. You can test this by changing the primary key to a different field. But for simplicity's sake, I did this experiment for you.
As you can see in the first and second attachments, ID is the primary key, set default by the program.
But when I set Field 8 as the primary key, shown in the third attachment, field 8 doesn't sort, shown in the fourth attachment.
