Question: Q: Please help to update this ERD by adding Subtype and Supertype. Now this is the third time I post this question and I didn't

Q: Please help to update this ERD by adding Subtype and
  1. Q: Please help to update this ERD by adding Subtype and Supertype.
  2. Now this is the third time I post this question and I didn't get a complete answer!
  3. This is homework and it's worth 10% on my final grade.
  4. Thanks I appreciate your efforts.

Family member Customer Manufacturer o Handset Type Handset Operating System Plan Plan Type

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