Which of the Following Describes the Role of the Inner

Which of the following describes the role of the inner mitochondrial membrane?

A) It acts as an anchor for the membrane-associated enzymes of cellular respiration.
B) It allows for the establishment of a proton gradient.
C) It separates the mitocondria's environment from that of the cytosol.
D) It anchors enzymes and allows for the establishment of the proton gradient, but it is not involved in separating the contents of the mitochondria from the cytosol.
E) It anchors enzymes, allows for the establishment of the proton gradient, and is involved in separating the contents of the mitochondria from the cytosol.