Which of the Following Are Not Enzymes Involved in Moving

Which of the following are not enzymes involved in moving phospholipids from one leaflet to another?

A) Flippases that move phosphatidylethanolamine and phosphatidylserine
B) Floppases that move phospholipids from the cytosolic leaflet to the extracellular leaflet
C) Flip-floppases that allow phospholipids to move back and forth between the inner and outer leaflets
D) Scramblases that allow phospholipids to move down their concentration gradient
E) Phosphatidylinositol transfer proteins that play a role in lipid signaling