When a storage resource has a snapshot taken of it, where are writes to the storage resource written?

When a storage resource has a snapshot taken of it, where are writes to the storage resource written?
A . New space allocated from the storage resource parent pool
B . New space allocated in 256 MB stripes from FAST Cache
C . Existing space of the storage resource
D . Existing space from the Reserves LUN Pool

Answer: A

Explanation:

Snapshots space are taken from parent pool not from the storage resource itself. Immediately after being created, a snapshot consumes almost no space for the pool as it still shares all of its blocks with the primary block or file resource.

However as new data is written to the parent resource, redirects occurs, and the snapshot begins to consume pool space that is not also associated with the current production version of the parent resource.