Which two statements are about Unplanned Device Loss in a vSphere 5 environment?

Which two statements are about Unplanned Device Loss in a vSphere 5 environment?

(Choose two)

A.
It is condition where an ESXi host determines a device loss has occurred that was not planned.

B.
Performing a storage rescan restores access to determine why device loss occurred.

C.
It is a condition where an ESXi host is unable to determine why device loss occurred.

D.
Performing a storage rescan removes the persistent information related to the device.

Explanation:
Page 132 from vsphere-esxi-vcenter-server-50-storage-guide.pdf