Here we are given some info about a school that holds info like classes, students, and grades. The question is which one is which one represent data and which one represents metadata. If it is data,...

Here we are given some info about a school that holds info like classes, students, and grades. The question is which one is which one represent data and which one represents metadata. If it is data, does it appear to be structured or unstructured.And if it's metadata, state whether it is a fact describing a property of data or a fact describing the context of data (I'm struggling with this one the most.)

Here are the answers I have. I believe I'm on the right track but I could use more guidance on whether the statement for metadata is considered property or context of data.

Students name and address.  (data- structured)

Grades for a course offered in database design. (data - structured)

The resolution of a student’s ID photo in pixels. (metadata -context)

Length of the course number field. (metadata)

The fact that the student ID field is the primary key for students. (data) not sure here