Hi, as per your project description, we need 3 separate classes for 'customer', 'care giver' and the 'healthcare agency'. The customer class will have attributes like time preference, request type and service location. Care giver class will have the attributes of availability and relevant skill-set. Finally, the healthcare agency class will define several methods to ensure optimal allocation of caregivers to the customers. Several algorithms and data structures can be used in this project. For example, linked lists can be used to ensure that new customers can be added with great ease. A FIFO algorithm can be employed to make sure that the first requests are serviced first. Besides, there are a number of other algorithms that are needed for a smooth functioning of the overall healthcare system, and I will be happy to go into details should you be interested. I have expertise in both C++ and Java but I would prefer to do this project in C++, given its object-oriented nature. In addition, I will fully document the code and explain all the critical pieces. Please feel free to get back to me in case you have any questions.