Which two communication scenarios are valid?

Domain Dl contains two machines, Ml and M2, and is configured to use TIBCO Rendezvous as the messaging transport.

Ml will host:

> the Primary Domain Server PDS1

> one TIBCO Hawk Agent HA1

> one TIBCO ActiveMatrix BusinessWorks Engine BWE1 M2 will host:

> one TIBCO ActiveMatrix Adapter for Database ADB2

> one TIBCO Hawk Agent HA2

> one TIBCO EMS Server

Which two communication scenarios are valid? (Choose two.)
A . PDS1 communicating with HA1 using EMS
B . PDS1 communicating with HA2 using TIBCO Rendezvous
C . HA1 communicating with ADB2 using TIBCO Rendezvous
D . BWEl communicating with ADB2 using EMS