An administrator would like to test out an open source based phone system prior to making an investment in
hardware and phones. Which of the following should the administrator do to BEST test the software?

A.
Create virtual IP phones in a lab that utilize the STP protocol

B.
Deploy an open source VDI solution to create a testing lab

C.
Deploy new SIP appliances and connect to it with the open source phone applications

D.
Create a virtual PBX and connect to it with SIP phone applications