QUESTION 19 Thepr archive process retains copies of data over extended periods of time in order to meet legal and operational requirements. O virtualization O patching O backup QUESTION 20 Security concerns that result from the use of virtualized systems include O guest Os isolation O guest OS monitoring by the hypervisor ( virtualized environment security O all of the above QUESTION 21 The most important changes needed to improve system security are to O disable remotely accessible services that are not required O ensure that applications and services that are needed are appropriately configured O disable services and applications that are not required O all of the above QUESTION 22 To exploit any type of buffer overflow the attacker needs to understand how that buffer will be stored in the processes memory. O True False