What is required to convert a VM to a template?

What is required to convert a VM to a template?

A. Reregister the template.

B. Choose a thin-provisioned format.

C. Select a storage policy.

D. Power off the virtual machine.

Reference: https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.vm_admin.doc%2FGUID-846238E4-A1E3-4A28-B230-33BDD1D57454.html