Which of the following are true?

Please select all that apply.

When there are no items left to iterate, the $\_()$ method must raise a Stoplteration exception.

An iterator class must contain the $($self$)$ method that returns the next element in the container object.

To enable the traversal using a for loop in a container object, the container class must implement the $\_($self$)$ method that returns an iterator.

An iterator is an object that provides a uniformed way for traversing the elements in a container object.