Based on the queue implementation code shown, which of the following statements are correct?

Based on the queue implementation code shown, which of the following statements are correct?

Code Snippet:

int data = items[front];
items[front] = -1;
if (front == rear) {
    front = -1;
    rear = -1;
} else {
    front = (front + 1) % SIZE;
}
return data;

int main() {
    enQueue(1);
    enQueue(2);
    enQueue(3);
    enQueue(4);
    enQueue(5);
    enQueue(6);
    printf("%d ", deQueue());
    printf("%d ", deQueue());
    return 0;
}