Which of the following is the best reason to add a second supplier for a critical component? 

a. The primary supplier is located in a flood-prone region, while the second supplier’s location is not subject to flooding. 

b. The second supplier is able to offer the same lead time as the first supplier. 

c. Adding a second supplier helps reduce the bullwhip effect. 

d. Adding a second supplier will increase the firm’s purchasing power for the component.