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)

Please describe the matter of abuse