1. Sedimentation velocity (SV-AUC) is an analytical ultracentrifugation method that measures the rate at which molecules move in response to centrifugal force generated in a centrifuge. This sedimentation rate provides information about both the molecular mass and the shape of molecules.
https://www.ap-lab.com/sedimentation-velocity2. A sedimentation rate is common blood test that is used to detect and monitor inflammation in the body. The sedimentation rate is also called the erythrocyte sedimentation rate because it is a measure of the red blood cells (erythrocytes) sedimenting in a tube over a given period of time.
https://www.medicinenet.com/sedimentation_rate/article.htmSO, sedimentation velocity is a method that measures sedimentation rate.
I think it is clear from the context that correct answer must therefore be sedimentation rate.