What is a benefit of using the dollar variable (as in $TARGET01) when creating queries in Cisco Security MARS?

What is a benefit of using the dollar variable (as in $TARGET01) when creating queries in Cisco Security MARS?

A.
The dollar variable enables multiple queries to reference the same common 5-tuple information using a variable.

B.
The dollar variable ensures that the probes and attacks that are reported are happening to the same host.

C.
The dollar variable allows matching of any unknown reporting device.

D.
The dollar variable allows matching of any event type groups.

E.
The dollar variable enables the same query to be applied to different reports.

F.
The dollar variable enables the same query to be applied to different cases.