a) Write at least 10 business rules for the ER Diagram below Horizon PKFK1 | PROTid PK,FK1 PROTdate PK HRZid Equipment PK EQPnumber Haul HRZname HRZmaterial is part of -----OH EQPserial EQPyear EQPmanufacturer EQPmodel EQPtype EQPdelivery_date EQPtires EQPfleet Production_trucks TS_Crew_Rotation PK PROTid PROTdate PK CRRid -H--Requires -- PK PK CRRdate PROTload PROTtons FK1 EMPid $ FK2 EQPnumber Consumes Contains Drives FUEL PK FULid Crew_Code PK CRCid CRCname FK1 CRRid FK1 CRRdate FULdate Employee FULtype PK EMPid FULlocation FH------Delivers-------- FULamount EMPfirstname FULmotor_hours EMPlastname FULcraft_hours EMPaddress FK1 EMPid EMPzip PROTG EMPtelephone FK2 EQPnumber ) How many entities are in the ER Diagram above and what are they? List composite keys from the above ER Diagram