What Is the Difference Between Mutualism and Synergism

What is the difference between mutualism and synergism?

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