What is the easiest way of ensuring that others can access a presentation that a user has created and make changes to it, while also ensuring that those changes are tracked and coauthoring can occur? Save to removable media.
Email the file.
Store on OneDrive and share.
Make a second copy of the file.

solution:

this situation is called an ip conflict.

data from a server is sent in small bits called packets. in an ip conflict, some packets will end up in one computer while some other packets will end up in another computer.

so…overall none of the computers get the data as the original message or picture being sent by the server cannot be retrieved with only half the packets. so it will show up as an error.

thus the final answer is d.

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