Which design pattern would be most appropriate to use in this integration?

Your company uses a payroll application that was developed using Java technologies. The
company has acquired another company and plans to integrate its payroll process in
existing application. You have been asked to implement this integration. You observe that
the business logic adopted to calculate the payroll is different in both companies. Which
design pattern would be most appropriate to use in this integration?

A.
Payload Extractor

B.
Service Locator

C.
Strategy

D.
Composite

E.
Fly Weight