JavaScript

Please explain

6. Which ONE of the following is TRUE about the code below? (function({ let x = 100; let foo = function() {x *= 2;}; foo(); console.log(x); })(); a. It is not legal because the function has no name. b. It is not legal because the function definition is invoking itself. c. It prevents x and foo from being visible outside the function. d. It is a Javascript example of recursion and will result in foo calling itself. e. It is not legal because x is not visible within the function referenced by foo. 7. Consider the following code meant to read a file and print out a single song as part of a Node.js application: const fs = require("fs"); let file Data; const inputFilePath = "songs/output.txt"; fs.readFile(inputFilePath, function(err, data, if(err) console.log('FILE READ ERROR"); file Data = JSON.parse(data); console.log(fileData.songs[0]); Which ONE of the following explains why this code would not work as the programmer likely intended? a. No ROOT directory is specified for the file path. b. readFile's callback function has no name to refer to. C.JSON.parse(data) will not work without a require('json') statement. d. console.log(file Data.songs[0]) is called before the file contents have been read. e. function(err, data) will be called before the file contents are read. 8. Why is reading or writing files synchronously a bad programming practice in Node.js? a. The Node.js HTTP server will not be able to handle additional requests until the file input/output has finished. b. It makes the code more difficult to understand. C. It requires knowledge of multi-threaded programming. d. All of the above. e. None of the above. 9. When a client is polling a server using XMLHttpRequest, which HTTP method would generally be most appropriate? a. DELETE b. GET C. POLL d. POST e. PUT 10. An HTTP status code of 201 is generally used to indicate: a. An error on the server occurred. b. The dient's request was formatted incorrectly C. A resource was successfully created on the server. d. The client is not authorized to access the specified resource. e. None of the above