What Is the Difference Between Mutualism and Synergism

What is the difference between mutualism and synergism?

A) In a synergistic relationship the organisms cannot survive without each other.
B) In a mutualistic relationship the organisms are dependant upon each other.
C) In a mututalistic relationship both organisms benefit,but in a synergistic relationship both organisms are harmed.
D) In a synergistic relationship both organisms benefit,but in a mutualistic relationship both organisms are harmed.