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 remote diagnostics use Avaya SAL or SSL/VPN secure connections.
B . IPOSS is required with every IP Office solution.
C . IPOSS can be sold under wholesale and co-delivery models.
D . IPOSS includes 24×7 support.
E . IPOSS is sold only through authorized Avaya partners.