This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to hide pictures on galaxy s4 
Download a file manager app. 
The most popular free file manager is " es file explorer ". This app will allow you to manipulate the files stored on your device, without needing to connect the s4 to a computer.

OPTIONS: (I) For extended users, download finder app. The app is free; without an app icon, the picture will remain hidden.; (II) It will download the file explorer package, such as cd/dvd, and create the image (s) you want to hide, like the thumbnail, add-on files, and so on. They are available on google play and your phone's app store, and will load almost instantly.; (III) You can find this app on google play's menu bar at the top of your screen. Connect your galaxy s4 to your computer using a usb port.; (IV) Navigate to the picture you want to hide. Pictures that you've taken are typically in the " dcim " folder, while pictures that you've downloaded can usually be found in the " downloads " or " pictures " folders.;
The answer is:
(IV)