Which of the following are the strategic features of Avaya reduce the total owing cost and the offering value for the customers? (Please Choose Two)

Which of the following are the strategic features of Avaya reduce the total owing cost and the offering value for the customers? (Please Choose Two)
A . Reduce the number of hardware via virtualization
B . Interoperability between manufacturers
C . Complex server cluster
D . "rip and replace"
E . Patent standards

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Answer: AB