Which of the following represents the basic distinction between a bilateral contractand a unilateral contract

a. The rights under a bilateral contract are assignable, whereas rights under aunilateral contract are not assignable.

b. Only one promise is involved ifthe contract is unilateral but two promises if the contract is bilateral.

c.

Specific performance is available if the contract is unilateral whereas it is not if the contract is bilateral.

d. The Statue of Frauds applies to a bilateral contract but not to a unilateral contract.