The birth may be marked by a baby (twins may be represented by two births), a mother, several nurses, and a doctor. Therefore, assume that there are the Babies, Mothers, Nurses, and Doctors entity sets. Consider also the Birth relationship that unites these entity sets. Note that a multiple of the birth relation set will have the following form: (baby, mother, nurse, doctor). Each assumption given below should be reflected in the ER diagram.

(a) for each infant there is only one mother.

(b) for each combination of nurse, baby and doctor, there is one single mother. (c) there is only one doctor for all combinations of a baby and a mother.

Create the ER diagram with the requirements and constraints given above.

From what I understand from the question there should be only one ER diagram even though there are 3 options.