How can an administrator verify that a node is successfully shut down?

How can an administrator verify that a node is successfully shut down?
A . Verify the LEDs on the front panel are not lit.
B . Execute the isi status -q command and see that the node is in a D— status.
C . Execute the isi status -q command and see that the node is in an A– status.
D . Try to access a share on the node and verify the share is inaccessible.

Answer: B