In Physics, the term "reference frame" includes
(A) the boundary of a physical system.
(B) the places that distances are measured from.
(C) a table that measurements are written in.
(D) the identity of the observer.
In Physics, the term "reference frame" includes
(A) the boundary of a physical system.
No.
That would be more like a picture frame.
In Physics, the term "reference frame" includes
(B) the places that distances are measured from.
Yes.
It includes some other things too.
In Physics, the term "reference frame" includes
(C) a table that measurements are written in.
No.
That would be a data table.
In Physics, the term "reference frame" includes
(D) the identity of the observer.
No. --- However, different observers
might use different frames of reference.