Which of the following represents the basic distinction between a bilateral contract and a unilateral contract?
a. Specific performance is available if the contract is unilateral but not if it is bilateral.
b. Rights under a bilateral contract are assignable, whereas rights under a unilateral contract are not assignable.
c. The statute of frauds applies to a bilateral contract but not to a unilateral contract.
d. Only one promise is involved in the contract is unilateral, but two are involved if it is bilateral.