The purpose of a mainframe audit is to provide assurance that processes are being implemented as required, the mainframe is operating as it should, security is strong, and that procedures in place are working and are updated as needed. The auditor may accordingly make recommendations for improvement. Which of the following types of audit always takes high priority over the others?

A. System audit

B. Application audit

C. Software audit

D. License audit

E. Security server audit

F. None of the choices.