Atechnicianworksinadatacenterthatissharedbymultiplecompanies.Thetechnicianisconcernedwithpreventingthetheftofproprietaryinformationbyothertechnicianswithaccessto thedatacenter.WhichofthefollowingistheBESTwaytopreventdatatheftinthisscenario？（）
A.Mantraps
B.Two-factorauthentication
C.Securitypersonnel
D.Lockedrackdoors
参考答案：D
