What is virtual LUN migration supported on a Symmetrix V-Max array?

A.
Between flash drives and Fibre Channel drives

B.
Between a standard device and a virtual device

C.
Between a smaller devicesizesto a larger device

D.
Between a smallermembersMetato larger

Explanation:
Source: http://wikibon.org/blog/details-on-emcs-v-max-virtual-lun-technology- enhancements/