Rank the reliability of the following items of audit evidence from best $(1)$ to worst $(4)$

Bank statement provided by the bank

A customer confirms his balance in response to a telephone enquiry

The finance director says an invoice has been paid

A list of unpaid invoices extracted from the client's accounting records

$\backslash$table$[[$Bank statement provided by the bank,$],[$A customer confirms his balance in response to a telephone enquiry,$],[$The finance director says an invoice has been paid,$],[$A list of unpaid invoices extracted from the client's accounting records,$]]$