Disable USB drive

Hello ALL

we are using 2012 R2 DC and want to disable the USB divices in all the client machines

i found the path as below, however i am not able to find system under Administrative Temp. Please advise, what am i missing

1. User Configuration-> Policies-> Administrative Templates-> System->Removable Storage Access
2. Computer Configuration-> Policies-> Administrative Templates-> System-> Removable Storage Access

thanks

NA