Which step in Mark’s installation plan is NOT necessary?

Mark is preparing to install VPN-1/FireWall-1 and has created the installation plan below.
1. Perform the following operations below in sequential order.
2. Install the operating system.
3. Configure routing and IP forwarding.
4. Configure name resolution.
5. Patch the operating system.
6. Set $FWDIR and $CPDIR environment variables.
7. Install VPN-1/FireWall-1.
8. Patch VPN-1/FireWall-1,
Which step in Mark’s installation plan is NOT necessary?

A.
Operating-system patches should not be applied, until after VPN-1/FireWall-1 is installed.
Applying operating-system patches before VPN-1/FireWall-1 is installed will result in an unsecured
system.

B.
VPN-1/FireWall-1 configures name resolution automatically. Name resolution should not be part
of the installation plan.

C.
There is nothing wrong with Mark’s installation plan.

D.
Routing and IP Forwarding should be configured after VPN-1/FireWall-1 is installed.
Configuring routing and IP forwarding before VPN-1/FireWall-1 is installed will result in an unstable
system.

E.
VPN-1/FireWall-1 configures environment variables automatically. Configure environment
variables should not be part of the installation plan.