When inspecting a client's abdominal contour, the nurse observes the abdomen to be sunken with the lower edges of the ribs visible. The nurse documents this as which of the following?

A. Flat: A flat abdomen is level with no visible protrusions or concavities.B. Protuberant: A protuberant abdomen appears swollen or distended, common in obesity or ascites.C. Rounded: A rounded abdomen has a convex contour, commonly seen in children or adults with mild weight gain.D. Scaphoid: A scaphoid abdomen appears sunken or concave, often showing visible lower ribs, suggesting malnutrition or dehydration.