Java Concurrency and Deadlock

Consider the MultiLock class shown below. Which of the following statements best describes a potential concurrency problem in this class?

public class MultiLock {
    private int[] arrayA = new int[2];
    private int[] arrayB = new int[2];
    
    public void methodOne() {
        synchronized(arrayA) {
            try { Thread.sleep(50); } catch (InterruptedException e) {}
            synchronized(arrayB) {
                arrayA[0] = 10;
            }
        }
    }
    
    public void methodTwo() {
        synchronized(arrayB) {
            try { Thread.sleep(50); } catch (InterruptedException e) {}
            synchronized(arrayA) {
                arrayB[0] = 20;
            }
        }
    }
    
    public static void main(String[] args) {
        MultiLock ml = new MultiLock();
        Thread t1 = new Thread(() -> ml.methodOne());
        Thread t2 = new Thread(() -> ml.methodTwo());
        t1.start();
        t2.start();
    }
}