which one is correct ?A nonserial schedule of database transactions is conflict serializable when a. There exists a possible nonserial schedule of the same set of transactions such that in both schedules the order of conflicting operations is the same b. There exists a possible serial schedule of the same set of transactions such that in both schedules the order of conflicting operations is the same c. There exists a possible serial schedule of the same set of transactions such that in both schedules the order of conflicting operations is not the same d. There exists a possible nonserial schedule of the same set of transactions such that in both schedules the order of conflicting operations is not the same