Provide a separate ER diagram representing each of the following situations.

1.A is an entity. It has an attribute, a_id as its identifier. B is a weak entity that depends on A. It has b_id as its discriminator. Many instances of B may belong to the same instance of A.

2. A, B, and C are entities. There is a relationship between all three, called D. For each A and B there is one C. For each B and C there can be many As. For each A and C, there is one B. Every time the relationship, D, is satisfied, a single value, Note, will be stored.