You will be given a definition of a task first, then some input of the task.
In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to start using the pinnacle video transfer device [title] Examine the product, so, we have the rca inputs, which is s-video, composite video, and audio. [step] This is the analog in. The digital out has the usb2.com, and the power supply. <sep> (A) [title] Update the firmware of the video transfer. [step] To do this, download the latest firmware on a flash stick, plug the flash stick into the unpowered video transfer. (B) The power supply, also called this vtv plug-in, only has these types of input. [title] Find the vtv pedal, and go to start. (C) The processor is capable of using thousands of media. [title] At this to do that, go to the system tab and change the ios ip address (ios system). (D) It has no access to itunes fans, which is why it is difficult to network. Here's how to use the gadget.
Output:
A