The survey of the diagnostic cast that is done as part of a removable partial denture design procedure is needed to
1. determine the path of insertion of the removable partial denture.
2. evaluate the retention potential of the abutment teeth.
3. evaluate the modifications needed to create parallel guiding planes.
4. locate the height of contour abutment teeth.

All of the above.

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only