You are upgrading the Cisco Unity server from version 4.0(1) to version 4.0(4). Which two steps should you perform to ensure a successful upgrade? (Choose two.)

A.
Obtain a new Cisco Unity License file.

B.
Run the Database Optimizer to ensure a “clean” database.

C.
Run the AD Schema Extension utility.

D.
Run the Cisco Unity System Preparation Assistant.

E.
Run the Cisco Unity Upgrade tool.