Which of the following clinical approaches would reduce the tendency to the post-extraction complication of dry socket?
1. Post-extraction socket dressing with topical chlorhexidine.
2. Pre-extraction control of pericoronitis.
3. Use of a pre-operative mouthrinse of 0.2% chlorhexidine gluconate.
4. Use of systemic antibioprophylaxis.

All of the above.

(2) and (4)

(4) only

(1) (2) (3)

(1) and (3)