Exercise v3.0

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A dynamic component is mounted once, but the component you see (the active one) can change.

Which lifecycle hooks do we need to use in order to run code when such a component becomes active, and to run code when it is no longer active?

We need the '@(9)' and '@(11)' lifecycle hooks for that.

We need the 'activated' and 'deactivated' lifecycle hooks for that.

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