What diagnostic steps are commonly taken to diagnose Inflammatory Bowel Disease (IBD), including tests for inflammation and visualization of the GI tract?
a) First rule out other conditions, followed by stool tests, imaging tests (CT or MRI), and tissue biopsy through colonoscopy or endoscopy.
b) First rule out other conditions, followed by stool tests and endoscopy for UC or colonoscopy for Crohn's disease.
c) First rule out other conditions, followed by stool tests, CT scans, and sigmoidoscopy for both UC and Crohn's disease.
d) First rule out other conditions, followed by stool tests, endoscopy for UC, and CT scans for Crohn's disease.