Adeveloper working on a time management application wants to make total hours for each timecard available to application users. a timecard entry has a master-detail relationship to a timecard. which approach should the developer use to accomplish this declaratively?
(a) a roll-up summary field on the timecard object that calculates the total hours fromtimecard entries for that timecard
(b) a process builder process that updates a field on the timecard when a timecard entry iscreated
(c) an apex trigger that sues an aggregate query to calculate the hours for a given timecard andstores it in a custom field.
(d) a visualforce page that calculates the total number of hours for a timecard and displays it onthe page.