How many spare 4 TB drives are needed to complete the conversion?

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You have a RAID-DP aggregate with 42x 4 TB NL-SAS drives. The aggregate contains 3x RAID groups of 14 drives each (12 data + 2 parity), for a total of 36 data and 6 parity drives.

You decide to convert the aggregate to RAID-TEC for higher resiliency.

How many spare 4 TB drives are needed to complete the conversion?
A . 1
B . 2
C . 4
D . 3

Answer: D