I can't seem to work a way for my recommend program to track "Invalid Answers"

Here is the code: do { System.out.println("Question #1:");

    System.out.println("What is your budget for purchasing the laptop?");

    System.out.println("A. >$500.00");
    System.out.println("B. $500.00 - $700.00");
    System.out.println("C. $700.00 - $1000.00");
    System.out.println("D. <$1000.00");
    questionArray [0] = myScanner.nextLine();
    if (!questionArray [0].equals ("A") || !questionArray [0].equals ("B") || !questionArray [0].equals ("C") || !questionArray [0].equals ("D")) {
      System.out.println("Invalid Entry");
    }}while (!questionArray [0].equals ("A") || !questionArray [0].equals ("B") || !questionArray [0].equals ("C") || !!questionArray [0].equals ("D"));

Basically, even when I write a valid response (eg. "A") it still counts it as an invalid answer, and restarts the question. Any help would be greatly appreciated! :)