Which Avaya IP Office TM edition supports the new Web RTC High Availability feature?

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?

Before you can ask any questions, a prospective customer contact says, "Look, my job is to replace an obsolete phone system for the least possible cost."
Which of the following feature sets will your proposal emphasize?