During an abdominal assessment, which of the following findings would be considered abnormal and warrant further investigation? (Select all that apply)

A. Soft and symmetrical abdomen: A soft, non-tender, and symmetrical abdomen is a normal finding and generally indicates no acute abdominal pathology. B. Prominent venous patterns with dilated veins: Visible, dilated abdominal veins can indicate portal hypertension, liver disease, or obstruction of venous return. This finding warrants further evaluation to determine the underlying cause. C. Tympanic upon percussion of the abdomen: Tympany is a normal percussion sound over most of the abdomen due to the presence of gas in the intestines. This is an expected finding during assessment. D. Positive rebound tenderness: Rebound tenderness suggests peritoneal irritation, which may indicate appendicitis, peritonitis, or other acute abdominal conditions. Immediate investigation is necessary. E. Centrally located and inverted umbilicus: A midline, inverted umbilicus is a normal anatomical finding and does not require further evaluation unless accompanied by other abnormalities such as hernia or discharge. F. Hyperactive bowel sounds in all quadrants: Hyperactive bowel sounds may indicate early bowel obstruction, gastroenteritis, or diarrhea. This abnormal finding should be assessed further to identify the cause.