Emily is functioning with her customer, anna, on the design of a new database. she describes to anna that key fields are utilized to access, coordinate, and preserve the data records. anna asks if it is manageable to fetch records using a field or combination of fields that is not unique. emily tells her that it is possible using one type of key. identify the type of key used here. a. ancillary keyb. foreign keyc. candidate keyd. multifaceted key