NO$\mathrm{.}447$ A programmer has made unauthorized changes to key fields in a payroll system report. Which of the following control weaknesses would have contributed MOST to this problem?$($A$).$ The programmer did not involve the user in testing$($B$).$ The user requirements were not documented$($C$).$ The programmer has access to the production programs $($D$).$ Payroll files were not under the control of a librarian