II$-$ EER diagram

Draw the EER diagram for the following systems.

Persons in an organization are employees or customers or visitors. Employees have computers. The IT department of the company builds all its computers from components. Each computer consists of several components like graphic cards, network cards, mother boards, memory capsules, hard discs, etc. When a component is bought from a supplier it is given an ID number. The finished computer is placed in a room, which may contain several computers. Prepare an EER diagram using only the concepts listed above, that shows, as necessary, entities, relationships, specializations and generalizations. Show the most likely cardinalities $($min$,$ max$)$ for all relationships.

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