In order to achieve a proper interproximal contact when using a spherical alloy, which of the following is/are essential?
1. A larger sized condenser.
2. A thinner matrix band.
3. A properly placed wedge.
4. Use of mechanical condensation.

All of the above.

(4) only

(2) and (4)

(1) and (3)

(1) (2) (3)