Which IBM storage solution provides the least latency?

Which IBM storage solution provides the least latency?

A. IBM FlashSystem 9100
B. IBM FlashSystem 900

C. IBM FlashSystem V9000

D. IBM FlashSystem A9000

Reference: https://www.ibm.com/developerworks/community/blogs/5things/entry/5_Things_to_know_about_IBM_FlashSystem_V9000?lang=en