Miriam is a senior manager for an international chain of fitness centers. Two suppliers provide exercise machines for her company. Which of the following is the wisest advice on how Miriam should manage her suppliers?

1. Eliminate one of the suppliers based on the quality of machinery and speed of shipping.

2. Keep the relationships as they are and focus on other matters, since suppliers are not essential to this type of organization.

3. Eliminate one of the suppliers based on the lowest total price for each machine.

4. Seek out potential new suppliers who can meet or exceed the quality standards of existing suppliers.