Answer: The journal of someone who was there at the time.
Explanation: The journal of a person who was present at the fall of the Berlin wall would be a perfect source, or footage of the event, or anything first-person. People who were actually there and participated are always the best sources for any historical event. (:
All of above because all of those answers are geared to the Authors and important details
<span>"So-called anonymous tracking is not very secure—the anonymity is fairly easily broken. Cracking [it]...is a fairly easy engineering feat."
This example maintains the main idea of the passage, keeping its message in tact while eliminating information using ellipses to improve clarity. The addition of "it" also helps make it clearer and more concise. </span>
