CLIENTS $($ClientID$,$ ClientName, ClientAddress$)$

ENGAGEMENTS $($EngageID$,$ EngageTypeID, ClientID, EngageManagerID, EngageFee$)$

ENGAGETYPE $($EngageTypeID$,$ description$)$

ENGAGEACCOUNTANT $($EngageID$,$ AcctID, hours, billable hours$)$

ACCOUNTANTS $($AcctID$,$ AcctName, BillingRate$)$

CERTIFICATIONS $($CertificationCode$,$ Description$)$

ACCOUNTANT$\_$CERTIFICATIONS $($AcctID$,$ CertificationCode$)$

what are the primary and foreign keys