How many SSDs would be added during this upgrade?

A customer with a minimum IBM XlV configuration is upgrading to a full rack and plans to add SSDs for performance.

How many SSDs would be added during this upgrade?
A . 12
B . 6
C . 15
D . 9

Answer: D

Explanation:

A minimally populated rack for models 281x-114 and 281x-214 contains three data modules and three interface modules, for a total of six modules.

A fully populated rack contains nine data modules and six interface modules, for a total of 15 modules.

References: https://www.ibm.com/support/knowledgecenter/en/STJTAG/com.ibm.help.xivgen3.doc/Gen3/PG/xiv_pln3rackconfigurations.html