Which of these is a key deliverable in the design phase?

Which of these is a key deliverable in the design phase?

A.
Low Level Design, Staging Plan, Operations Plan, Migration Plan

B.
WLAN Site Readiness Assessment Report, Voice over WLAN Assessment Report, Operations
Readiness Assessment Report

C.
Business Requirements Document, Preliminary Discovery Document, Technology
Requirements Document, Financial Analysis and Business Case

D.
As-Built Solution Binder, Operations Support Plan Report, Change Management Status Report

E.
Escalation Plan, Communications Plan, Staff Training Plan