Which feature of a base IBM XIV system is a technical advantage over competitive storage arrays?

Which feature of a base IBM XIV system is a technical advantage over competitive storage arrays?
A . SSD adaptive read caching
B . Always-on Compression
C . IBM Spectrum Control software
D . Hot encryption

Answer: D

Explanation:

Uniquely among IBM products, the XIV Storage System offers hot encryption. When encryption is enabled

References:https://www.ibm.com/support/knowledgecenter/en/STJTAG/com.ibm.help.xiv.doc/xiv_elearni

ng_reinventingstoragewithxivscript.htmlIBM XIV Security with Data-at-Rest Encryption, page 2