What distinguishes a void contract from a voidable contract?

Select one:

a$.$ A void contract is formed with illegal intent, while a voidable contract is formed under duress.

b$.$ A void contract is automatically terminated, while a voidable contract remains valid until rescinded.

c$.$ A void contract lacks one or more essential elements, while a voidable contract can be set aside by one party.

d$.$ A void contract can be enforced by the court, while a voidable contract cannot.