Contact areas of anterior teeth which are placed in centre of middle third ____________?

Contact areas of anterior teeth which are placed in centre of middle third ____________?

A. Mesial contacts of maxillary lateral and canine
B. Distal contacts of maxillary centrals and laterals
C. Distal contacts of maxillary laterals and canine
D. Mesial contacts of maxillary first and second premolar

The contact area on the distal surface of a maxillary first premolar should be placed in________________?

The contact area on the distal surface of a maxillary first premolar should be placed in________________?

A. Middle 3rd of proximal surface with lingual embrasure greater than the facial embrasure
B. Occlusal 3rd of proximal surface with the lingual embrasure greater than facial embrasure
C. Occlusal 3rd of proximal surface with facial embrasure greater than lingual embrasure
D. Middle 3rd with facial embrasure greater than the lingual embrasure