The lateral movement of transmembrane proteins can be restricted by several different mechanisms. Which mechanism best describes the process by which a budding yeast cell designates the site of new bud formation during cell division?
选项：

A: proteins are tethered to the proteins on the surface of another cell
B: proteins are tethered to the extracellular matrix
C: proteins are tethered to the cell cortex
D: protein movement is limited by the presence of a diffusion barrier