What is the advantage of setting the ASM-preferred mirror read for the Stretch cluster configuration?

What is the advantage of setting the ASM-preferred mirror read for the Stretch cluster configuration?

A.
It improves resync operations.

B.
This feature enables much faster file opens.

C.
It improves performance as fewer extent pointers are needed in the shared pool.

D.
It improves performance by reading from a copy of an extent closest to the node.