Salesforce Exam PDII Topic 4 Question 79 Discussion

Given the following information regarding Universal Containers (UC):

* UC represents their customers as Accounts in Salesforce

* All customer has a unique Customer-Number- c, that is unique across all of UC's systems.

* UC also has a custom Invoice_ c object, with a Lookup to Account, to represent invokes that are sent out from their external system

UC wants to integrate invoice data back into Salesforce so Sales Reps can see when a customer pays their bills on time.

What is the optimal way to implement this?

A)

B)

C)

D)