In peptic ulcer disease (PUD) perforation, how frequently is free air observed in abdominal X-rays (AXR), and what type of scans are typically obtained?
a) Free air is rarely seen; obtain an ultrasound
b) Free air is commonly observed; obtain a CT scan
c) Free air is rarely seen; obtain an MRI
d) Free air is commonly observed; obtain an abdominal X-ray (AXR)