Exercise $2\mathrm{.}4$ A company database needs to store information about employees $($identified by $ssn,$ with salary and phone as attributes$),$ departments $($identified by dna, with dname and budget as attributes$),$ and children of employees $($with name and age as attributes$).$ Employees work in departments; each department is managed by an employee; a child must be identified uniquely by name when the parent $($who is an employee; assume that only one parent works for the company$)$ is known. We are not interested in information about a child once the parent leaves the company.

Draw an ER diagram that captures this information.