Collimation Guidelines Include All of the Following Except for

Collimation guidelines include all of the following except for
1) chest and abdomen projections, collimate to within 1 inch (2.5 cm) of the patient's skin line.
2) extremity projections, collimate to within 0.5 inch (1.25 cm) of the skin line of the thickest VOI.
3) chest and abdomen projections, collimate to within 0.50 inch (1.25 cm) of the IR edge.
4) collimating structures within the torso, bring the collimated borders to within 1 inch (2.5 cm) of the VOI.

A) 1 and 3
B) 2 and 4
C) 3 only
D) 4 only