Final answer:
For an AP pelvis projection using Automatic Exposure Control (AEC), the center, and upper right and left ionization chambers should be activated to ensure even coverage and appropriate density. The correct answer to this question is b.
Step-by-step explanation:
The student has asked which ionization chamber(s) should be activated when using Automatic Exposure Control (AEC) for an AP pelvis projection. The correct answer to this question is b. Center, and upper right and left chambers. When an AP pelvis projection is conducted, it is important to properly expose the pelvis area, which generally includes using multiple AEC chambers to ensure even coverage and appropriate density throughout the pelvis region. This typically involves the use of the center ionization chamber as well as the upper right and left chambers in symmetric fashion to accurately gauge the exposure needed for the pelvis.