Which of the Following Statements Correctly Describe S_N2 and S_N1

Which of the following statements correctly describe S_N2 and S_N1 reactions?
I.S_N2 reactions proceed with retention of configuration.
II.S_N1 reactions prefer polar protic solvents.
III.S_N1 reactions can produce racemic products.
IV.S_N2 reactions are promoted in the presence of a substrate that produces a very stable carbocation.
V.S_N1 reactions have a unimolecular rate-determining step.

A) I,IIand V.
B) II,III,and IV.
C) III,IV and V.
D) II,IIIand V.
E) I,III,and IV.