A manufacturer of consumer goods has purchased one of its distributors. The distributor's inventory system is archaic and will not integrate into the manufacturer's enterprise resources planning (ERP) system. Which of the following approaches is the most appropriate long-term solution for the manufacturer?
选项：

A: Buy a complete ERP system that includes seamlessly integrated distribution.
B: Buy a warehouse management system that integrates into the ERP system.
C: Run the existing warehouse inventory system and update the ERP system manually.
D: Hire a software contractor to write an interface with batch update to the ERP system.