$4.$ Map the following BANK ER diagram into a relational database schema $($in table representations$).$ Specify all primary keys and foreign keys. BANK BRANCHES BANK$\_$BRANCH Bank $\_$ Nama Addis Cosa BRANCHEN V BANK BRANCH $/$ Charts Panch.no Code Name Addr Addr Branch$\_$no ACCTS $($ LOANS LOANS Acct$\_$no $($ Balance $($Loan$\_$no Amount Acet$\_$no Balance Loan no amount ACCOUNT Type LOAN $-$ Type A$\_$C Ssn Name San Name CUSTOMER Phone Addr