Where would you add the user-defined fields?

A company wants to track the performance of the caterers who they use for special events. They use a service contract with each caterer for the delivery of food at these events Each caterer is set up as a vendor and one item master is used for the service. An invoice is used to pay for each event.

After each event they want to record the freshness, presentation, and quality and provide a report on each event in the purchasing manager’s dashboard. You have decided to add a user-defined field for each metric.

Where would you add the user-defined fields?
A . Vendor master data
B . Service contract
C . A/P invoice
D . Item master data

Answer: B