Violation
The preparation of an anterior tooth for a metal-ceramic crown should provide 1. adequate length for retention and resistance form. 2. space for thickness of metal that will resist deformation. 3. space for thickness of porcelain. 4. a single path of insertion.
All of the above.
(2) and (4)
(1) and (3)
(1) (2) (3)
(4) only