Judy promises to pay Ashley $ $50$ ?to babysit her children. After Ashley babysits the children, Judy pays Ashley the $ $50$ ; thus each party has completed performance of each part of the contract. This is an example of a $($ n $)$ :

?a $.$ ?

executed contract.

? b $.$ ?

quasi $-$ contract.

? c $.$ ?

recognizance.

? d $.$ ?

executory contract.