Fellaini Co. operates a large department store and has a large internal audit department in place. The management of Fellaini Co. are keen to increase the range of assignments that internal audit undertake.Which of the following assignments could the internal audit department of Fellaini Co. is asked to perform by management?

A、Internalauditdepartmentmemberscouldundertake“mysteryshopperreviews”,wheretheyenterthestoreasacustomer,purchasegoodsandratetheoverallshoppingexperience.;
B、Internalauditcouldbeaskedtoassisttheexternalauditorsbyrequestingbankconfirmationletters.;
C、Internalauditcouldbeaskedtoimplementanewpayrollpackageforthepayrolldepartment.;
D、Internalauditcouldbeaskedtoassistthefinancedepartmentwiththepreparationoftheyear-endfinancialstatements.