Who proposed the fluid mosaic model of cell membrane structure in 1972?

Who proposed the fluid mosaic model of cell membrane structure in 1972?
  a. Davson and Singer
  b. Frye and Edidin
  c. Brown and Goldstein
  d. Singer and Nicholson
  e. Davson and Danielli

Question 2

A key discovery that weakened the Davson-Danielli sandwich model of cell membranes was that:a.
   membrane proteins form a solid sheet on either side of the phospholipid bilayer.
  b. membrane proteins form a solid sheet separating the phospholipid layer.
  c. the phospholipids do not associate with each other in the hydrophobic region of
  membranes.
  d. membrane proteins were not uniform and did not form flattened sheets.
  e. membrane proteins occurred in regular organized patterns on the surface of membranes.