A Number of Employees Report That Parts of an ERP

A number of employees report that parts of an ERP application are not working. The systems administrator reviews the following information from one of the employee workstations: Execute permission denied: financemodule.dll Execute permission denied: generalledger.dll Which of the following should the administrator implement to BEST resolve this issue while minimizing risk and attack exposure?

A) Update the application blacklist
B) Verify the DLL's file integrity
C) Whitelist the affected libraries
D) Place the affected employees in the local administrator's group