They are optional. The option is just not visible in that UI. If you have Windows 10 Pro or higher, open the Group Policy Management snap-in, navigate to "Computer Configuration > Administrative Templates > Windows Components > Windows Update", edit "Do not include drivers with Windows Update" and set it to 'Enabled'.

If you have Windows 10 Home you can get the same effect by manually creating the registry key the Policy controls. Go to "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate", create a new DWORD 'ExcludeWUDriversInQualityUpdate', and set it to '1'.