Under Which of the Following Conditions Is It Necessary to Use

Multiple Choice

Under which of the following conditions is it necessary to use a grid for an axial shoulder projection?
1) The AP measurement is over 4 inches (10 cm) .
2) The kilovoltage used is above 60.
3) The inferosuperior measurement is more than 4 inches (10 cm) .
4) The kilovoltage used is below 60.

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