Universal Containers has a new custom object for Invoices that includes an Invoice Number field. Before the Invoice object can be used, invoices will be migrated from an external system maintaining their current Invoice Number. After the migration, each new Invoice created in Salesforce must have a unique Invoice Number. How should the app builder configure the Invoice Number field?

A. Create a Text field, then change it to AutoNumber after the migration.
B. Create an AutoNumber field and migrate the Invoices in Invoice Number order.
C. Create a Text field and mark it as a unique external ID field.
D. Create a Text field for the original Invoice Number and an AutoNumber field for the Salesforce Invoice Number.

Suggest answer: A

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