Which of the following is the safest way to download and install a new program on a mobile device?

Which of the following is the safest way to download and install a new program on a mobile device?
A. Use the Bluetooth file sharing feature.
B. Download the program from an FTP site using the USB cord.
C. Use the app store to download and install the program.
D. Use NFC to copy the program from another mobile device.

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