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You are developing a Universal Windows Platform (UWP) app. The app must allow the user to select only one file at a time. You need to ensure that the app displays the appropriate dialog window. Which method should you use?
Correct Answer: A
Explanation/Reference: Explanation: To pick a single file. Windows.Storage.StorageFile file = await picker.PickSingleFileAsync(); if (file != null) { // Application now has read/write access to the picked file this.textBlock.Text = "Picked photo: " + file.Name; } else { this.textBlock.Text = "Operation cancelled."; } Reference: https://docs.microsoft.com/en-us/windows/uwp/files/quickstart-using-file-and-folder- pickers#pick-a-single-file-complete-code-listing