Let's consider the following annotations:

$,A$:$B$ means $A$ is of type $B.A$ is a single$-$valued attribute.

$A$:$\{B\}$ means $A$ is of a set of elements of type $B.A$ is a multi$-$valued

attribute.

$,A$: means $A$ is composed of attributes $x$ and $y$;$x$ of type $B$

and $y$ of type C$.$ A is a composite attribute.

Let's consider the following database description. This database is adopted by a

Project Management System $($PMS$)$ to manage Researchers and their related Projects.

$,$ Person $($ID$,$ name, address: