Gastric Ulcer More Condition_symptoms What Is The Best Way To Detect A Peptic Or Gastric Ulcer?

What is the best way to detect a peptic or gastric ulcer? - gastric ulcer more condition_symptoms

What is the best way to detect an ulcer or gastric ulcer anywhere in the gastrointestinal tract?
East:
1.CT scan?
2.Barium? (Swallow or enema)
3.Endoscopy or colonoscopy?
If anyone knows, please respond to the picture, because that is important.
And I thank you in advance:)