If the demand for bread at this supermarket is 30,000 loaves per year, what strategy should be

Question:

If the demand for bread at this supermarket is 30,000 loaves per year, what strategy should be adopted for acquiring bread? Both Machine A and Machine B are capable of meeting annual demand.
a. Continue buying from the supplier.
b. Install Machine A.
c. Install Machine B.
d. Install both Machine A and Machine B.