Which of the following statements are representative of a flat structure? Select all that apply.

a$.$

There are very few opportunities for advancement at Marshall Produce Inc. Once an employee starts on the line they tend to stay there.

b$.$

At the headquarters for Quentin Department Stores, there are $8$ levels of management between top executives and frontline employees.

c$.$

Job security at Preston Financial Group is high because employees feel good working in a large and well$-$established organization.

d$.$

Boxwood Garden Supply has all $250$ employees report to one manager.