Which command do you run, to check the status of the Oracle VDI Database?

A.
vdbstat -all

B.
vdi-db status

C.
vda-sql status

D.
vda-db-status

Explanation:
http://docs.oracle.com/cd/E36500_01/E36503/html/vdi-services-logs-check.html(see
8.5.3)