function Set-PrerequisiteOptions {
  # Windows updates cause the node to reboot at arbitrary times.
  Log-Output "Disabling Windows Update service"
  & sc.exe config wuauserv start=disabled
  & sc.exe stop wuauserv
  Write-VerboseServiceInfoToConsole -Service 'wuauserv' -Delay 1

  # Use TLS 1.2: needed for Invoke-WebRequest downloads from github.com.
  [Net.ServicePointManager]::SecurityProtocol = `