The correct answer is D. raspberry pi zero.
The Raspberry Pi Zero is a small single-board computer developed in the United Kingdom by the Raspberry Pi Foundation to promote teaching of basic computer science in schools and in developing countries. It does not have built-in Wi-Fi or Bluetooth, but these can be added using USB dongles.
The Raspberry Pi Zero W is a variant of the Raspberry Pi Zero that adds Wi-Fi and Bluetooth connectivity.
The Raspberry Pi Zero WH is a variant of the Raspberry Pi Zero W that has its Wi-Fi and Bluetooth antennas pre-soldered.
The Raspberry Pi 3 is a model of the Raspberry Pi single-board computer developed in the United Kingdom by the Raspberry Pi Foundation. It was released on February 29, 2016. The Pi 3 is the first Raspberry Pi to have a built-in Wi-Fi and Bluetooth adapter.