Given the following relational database tables, queries and query frequencies:

The database tables $($assume these tables were created without any foreign key constraint$)$:

Companies $($company name, company$\_$city$)$

Employees $($employee name, employee$\_$age, employee$\_$street, employee$\_$city$)$

Works $($employee name, company$\_$name, employee$\_$salary$)$

Manages $($employee name, manager$\_$name$)$

The queries performed on the above tables and the query frequencies:

Insert a new company $(10/$year$)$

Insert a new employee and assign the employee to work for a company $(10/$month$)$

Insert a manager for an employee $(10/$day$)$

Find the names of all companies located in a particular city $(100/$day$)$

Find the names and ages of all employees whose salaries are between a particular amount of $x$ dollars and a particular amount of $Y$ dollars $(200/$day$)$

Using the scenario described above, which of the following is the most appropriate storage structure for the table Employees?