What is the most relevant reason that IP Office Support Services (IPOSS) should be proposed as an element of an Avaya IP Office TM solution?

What is the most relevant reason that IP Office Support Services (IPOSS) should be proposed as an element of an Avaya IP Office TM solution?
A . IPOSS is sold only through authorized Avaya partners.
B . IPOSS is required with every IP Office solution.
C . IPOSS includes 24×7 support.
D . IPOSS remote diagnostics use Avaya SAL or SSL/VPN secure connections.
E . IPOSS can be sold under wholesale and co-delivery models.

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Answer: A