What must be configured for tenant deployment?

The correct choice is related to the necessity of setting up Sequence Generator IDs and Reference IDs in order to ensure proper functionality within Workday's systems. Sequence Generator IDs are crucial as they create unique identifiers for transactions, which helps in maintaining data integrity and tracking of procurement processes. Similarly, Reference IDs provide a way to link related elements across transactions and different modules.

When configuring a tenant deployment, the Sequence Generator IDs and Reference IDs will facilitate the systematic organization and retrieval of data, enabling seamless integration across various functions within the Workday environment. This ensures that all transactions can be properly recorded and referenced, which is essential in a robust Procure to Pay process.

While other options may have importance in different contexts, they do not fall under the critical configurations necessary for the initial deployment of the tenant, thus making this choice the most relevant for setting up a functioning procurement environment.