Classify the Following Controls as Preventive,detective,or Corrective: Periodic Bank Reconciliation

Classify the following controls as preventive,detective,or corrective: Periodic bank reconciliation.Separation of cash and accounting records.Maintaining backup copies of master and transaction files.Pre-numbering of sales invoices.Chart of accounts.Retina scan before entering a sensitive R & D facility.Resubmission of transactions for subsequent processing.Internal auditor rechecking the debits and credits on the payment voucher.Depositing all cash receipts intact.Qualified accounting personnel