Pick all that apply

• 1Choice 1.

  The completion handler of URLSession.shared.dataTask is called on a background queue, so you have to get back to the main queue before putting the UIImage into the cell

• 2Choice 2.

  Data(contentsOf: url) is short, so using it inside cellForRowAt has no effect on scroll performance

• 3Choice 3.

  When a cell is reused, a late response from an earlier request can show the wrong image, so you have to compare the URL or cancel the earlier request

• 4Choice 4.

  downloadTask downloads to a file and gives you a temporary file URL, so if you don't move or read it right inside the completion callback the file can disappear

• 5Choice 5.

  Creating a task with dataTask(with:) starts the request automatically, so you can skip resume()