Valid consideration can include any promise to do something one has no obligation to do$,$ refrain from doing something one has the right to do$,$ or in the case of a unilateral contract, a performance when there is no obligation to do so$.$ This is known as a$($n$)\_\_\_\_\_\_\_\_\_\_.$

Question $15$ options:

a$)$

release

b$)$

legal detriment

c$)$

negotiation

d$)$

promissory estoppel

e$)$

exculpation