What is the BEST method to implement this HFA?

You are Security Administrator preparing to deploy a new HFA (HOTfix Accumulator) to ten Security Gateways at five geographically separate locations.What is the BEST method to implement this HFA?

A.
Send a Certified Security Engineer to each site to perform the update.

B.
Use SmartUpdate to install the packages to each of the Security Gateways remotely

C.
Use a SSH connection to SCP the HFA to each Security Gateway. Once copied locally, imitate a remote installation command and monitor the installation progress with SmartView Monitor

D.
Send a CD-ROM with the HFA to each location and have local personnel install it.