Consider a call centre with three personnel levels: responder, manager, and director. An incoming phone call must first be assigned to a responder who is available. If the respondent is unable to handle the call, it must be escalated to a management. If the manager is unavailable or unable to address the situation, the call should be escalated to a director. Create the classes and data structures needed for this problem. Create a dispatchCall () method that allocates a call to the first available employee.

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