A client of an insurance company can register as either a private or a corporate type of client. Each client is assigned a unique client-id and other details of the client including name, address and date of birth are stored in the system. For corporate type of clients the company registration number is recorded, and for private clients a VSHFLDOW\SHRILQVXUDQFHUDWHGHSHQGLQJRQWKHFOLHQWVDJHDQGSURIHVVLRQLVDSSOLHG

Each client will be registered to one particular insurance plan. However, each client may have different insurance plans on different period of time (some clients decided to change their plans). Each insurance plan may be made up of any number of common policies, each of which is given a unique policy-name. A policy may be part of a number of insurance plans. A date-time attribute is stored for each policy that has been registered within an insurance plan.

Which of the following EER diagrams is the best representation of the above problem statement? (Note: (i) for simplicity, participation has been omitted from the diagrams, (ii) PK attributes are underlined).