Why Is Recombinant Protein Production in Yeast an Efficient Strategy

Why is recombinant protein production in yeast an efficient strategy?

A) because yeast can easily be grown in large quantities
B) because yeast can secrete large amounts of recombinant proteins into their growth medium
C) because yeast are multicellular,so have a variety of cell types for recombinant gene expression
D) because yeast both can be easily grown in large quantities and can secrete large amounts of recombinant proteins into their growth medium
E) All of these answers are correct.