This question tests how well you understand the process for converting E/R diagrams to relational schemas. An E/R diagram when converted to relations (using the mechanical construction that we know and love) gives rise to the following relations: R (a, b, c) S (a, d) T (a, d, e, f) U (a, g)

You may assume that the same symbols refer to the same attribute and different symbols refer to different attributes (e.g., the attributes a in the relations R, S, and T are the same). Your task is to reverse-engineer the E/R diagram from these relations; in other words, what E/R diagram could have produced these relations? For full credit, give two different E/R diagrams that could have produced these relations