Violation
In gingivitis, the sulcular epithelium 1. is a barrier to bacterial invasion. 2. is permeable to bacterial enzymes and toxins. 3. may be ulcerated. 4. undergoes both degenerative and proliferative changes
All of the above.
(4) only
(2) and (4)
(1) and (3)
(1) (2) (3)