Which method should the administrator use to meet this requirement?

An administrator needs to migrate a company’s physical servers to virtual servers and deploy into the ESXi 5.x cluster. During the process of converting to a virtual machine, the administrator needs to reduce the size of the disks.
Which method should the administrator use to meet this requirement?
A. Use VMware Converter hot cloning with volume-based cloning at the file level
B. Shut down the physical server and use VMware Converter cold cloning with volume-based cloning at the block level
C. Use VMware Converter hot cloning with volume-based cloning at the block level
D. Shut down the physical server and use VMware Converter cold cloning with volume-based cloning at the file level