Which finding would suggest ulcer perforation in a client with PUD? Select all that apply.

A rigid abdomen indicates a serious condition such as ulcer perforation. When a perforation occurs, it leads to the leakage of gastric contents into the peritoneal cavity, which results in peritonitis. This inflammation of the abdominal lining often causes the abdominal muscles to become rigid as a protective response, known as "guarding." This finding is considered a classic sign of perforation and indicates the need for immediate medical attention.

Some of the other options can present with symptoms related to peptic ulcer disease (PUD) but do not specifically indicate perforation. For instance, pain relief after eating usually suggests a more typical presentation of peptic ulcers, as food can temporarily buffer gastric acid. Nausea and vomiting may also occur with various gastrointestinal issues, including PUD but are not definitive indicators of perforation. A high fever might arise from several conditions, including infections, but it is not a direct sign of ulcer perforation. Thus, the presence of a rigid abdomen is the most telling sign of potential ulcer perforation in this scenario.