Imagine you are a world$-$renowned management consultant. Teddy K$.,$ the owner of a sports magazine conglomerate contacts you and asks for your advice about some changes proposed by his management team. Which of the following changes are likely to give Teddy K$.\text{'}$s company a competitive edge? Check all that apply.

Be very selective when hiring new employees, using extensive interviews and tests to make sure applicants are a good fit for the job and the company.

Decentralize the organization and give additional authority to the employees who are closest to the customer.

Add an additional layer of management to more closely supervise employees' work.

Regularly fire the lowest$-$performing $10\%$ of employees in the company.