4. (40 points) Consider the following FD's: PERSON-NO NAME, DEPT PROJ-NO BUDGET, START-DATE, DEPT PERSON-NO, PROJ-NO, WEEK-NO TIME-SPENT ITEM-NO COST PROJ-NO, ITEM-NO QTY-USED DEPT MANAGER For each of the following relations, nominate the candidate keys and state which normal form the relation is. R1 = (PERSON-NO, NAME, DEPT, MANAGER) R2 = (PERSON-NO, NAME, DEPT, PROJ-NO, WEEK-NO, TIME-SPENT) R3 = (PROJ-NO, ITEM-NO, PERSON-NO, QTY-USED, WEEK-NO, TIME-SPENT) R4 = (PROJ-NO, ITEM-NO, PERSON-NO, WEEK-NO) R5 = (PROJ-NO, NAME, ITEM-NO, WEEK-NO, DEPT, BUDGET, START-DATE)