Violation
The roots of primary molars in the absence of their permanent successors 1. sometimes are partially resorbed and become ankylosed. 2. may remain for years with no significant resorption. 3. may remain for years partially resorbed. 4. are always resorbed.
(2) and (4)
(1) (2) (3)
(1) and (3)
All of the above
(4) only