Specific area shielding may be selectively used during some x-ray procedures to protect which of the following?

1. Lens of the eye
2. Breast
3. Upper extremities
4. Lower extremities

a. 1 and 2 only
b. 1 and 3 only
c. 3 and 4 only
d. 1, 2, 3, and 4

a. 1 and 2 only