Question: Suppose we have a circular queue where we choose to leave one empty cell. Which of the conditions is a test for an empty queue?

Suppose we have a circular queue where we choose to leave one empty cell. Which of the conditions is a test for an empty queue?
self._tail ==(self._head -1)
cross out
self._head == self._tail
cross out
(self._tail - self._head)== self._capacity
cross out
self._head ==(self._tail 1)
cross out

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