How to disable Wifi and Network access in low level setting for security ?

Hi
New to here
One of our final customer bought imac last months. OS 10.9, SN is c02*******J4i
Since they are security printing, all the necessary ports accessing to outisdes need to be disabled in low level setting(not the ons just like turn on and off ).
The ports including USB storage, Network and WIFI.
I googled and found the following
Open the /System/Library/Extensions folder.
To remove support for USB mass storage devices, drag the following file to the Trash: IOUSBMassStorageClass.kext
Open Terminal and enter the following command: $ sudo touch /System/Library/Extensions The touch command changes the modified date of the /System/Library/Extensions folder. When the folder has a new modified date, the Extension cache files (located in /System/Library/) are deleted and rebuilt by Mac OS X.
Choose Finder > Secure Empty Trash to delete the file.
Restart the system.
I want to confirm this before sending to final user. Since I didn't have mac on hand, just wonder whether there are similar kext files for network and wifi to remove.
Just like step 2 described.
I would like customer to backup these files before permanently removed.
Many thanks
Kevin
<Edited By Host>

chiqui wrote:
Is it possible to disable Internet access point and WAP as when I use WiFi some connections to WAP server of my provider are still made and I get charged. I am looking for the option not to delete it entirely from the access point list, but rather disable it as I might need connection when WiFi is not available and I want to be able to enable it as once I delete the server name and setting I won't know it.
Is it possible to do it and how?
You could delete WAP accesspoint. Not all providers (carriers) allow this.
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