You work as a senior administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All servers on the ABC.com network have Windows Server 2012 R2 installed. You are running a training exercise for junior administrators. You are currently discussing Storage Spaces.Which of the following is TRUE with regards to Storage Spaces？（）

A. Mirroring and parity are optional resilient storage modes of Storage Spaces.
B. Failover clustering is not supported by Storage Spaces.
C. Storage spaces are virtual disks with associated attributes such as a preferred level of resiliency，and thin or fixed provisioning.
D. Storage spaces are a collection of physical disks with associated attributes such as a preferred level of resiliency， and thin or fixed provisioning.