Which value of grade could stop the while loop? import java.util.Scanner; public class Guess { public static void main(String[] args) { int secret = (int) (Math.random()*60 -1); Scanner keyboard = new Scanner(System.in); int grade, sum = 0, count = 0; System.out.println("Enter grade"); = grade keyboard.nextInt(); while (grade != secret) { // secret is sential value } sum += grade; count++; System.out.println("Enter grade"); grade = keyboard.nextInt(); double average = sum / (double) count; System.out.println("average grade is " + average + " with "+count + " students");