What is recommended as a general guideline for making spare drive assignments?

A customer has a Dell EMC SC9000 array with six SC420 enclosures running SCOS 7.3.

The enclosure configuration is as follows:

– Two enclosures have write-intensive SSDs

– Four enclosures have read-intensive SSDs

What is recommended as a general guideline for making spare drive assignments?
A . 2 spare drives per shell
B . Dedicated spares are not required
C . 2 spares per drive type per array
D . 1 spare per drive type per shell

Answer: B