what two ways?

Storage capabilities be populated in what two ways? (Choose two.)

A.
The administrator can use tags to describe capabilities.

B.
Default capabilities are provided by vCenter Server.

C.
Datastores can advertise their capabilities through VAAI.

D.
Datastores can advertise their capabilities through VASA.

Explanation:
http://cormachogan.com/2015/02/17/vsphere-6-0-storage-features-part-5-virtual-volumes/