Question 4 Q: 4 Finish the sentence: The Library Web3.js is …: Options A: useful when developing distributed applications with HTML and JavaScript, because it already implements the abstraction of the JSON-RPC interface of Ethereum Nodes. B: necessary when developing distributed applications with HTML and JavaScript, because the proprietary JSON-RPC interface of Ethereum Nodes is a closed source. Save Question Show Answer Discussion 0 Clear Discussion Most voted Newest No comments yet. Be the first to comment. Post Be respectful. No spam. Correct Answer: A