What automation tool is suitable for updating a large number of records at once?

Batch Apex is the suitable automation tool for updating a large number of records at once because it is specifically designed to handle large data volumes in Salesforce. When dealing with bulk data operations, Batch Apex processes records asynchronously, allowing it to work around governor limits and efficiently manage resource-intensive tasks. By processing records in chunks, Batch Apex can update, create, or delete a significant number of records at once without overwhelming the system.

This capability is essential for operations that involve processing thousands of records, as it ensures that the execution remains within Salesforce’s limits. Additionally, Batch Apex supports complex logic, making it a robust choice for intricate business processes that require extensive record manipulation.

Other options like Scheduled Flows, Screen Flows, and Flow Orchestration are not ideal for bulk updates. Scheduled Flows can automate tasks but are typically used for operations that need to run periodically rather than for bulk updates. Screen Flows are designed for user interaction and are not suited for handling bulk record updates, as they focus on user-driven inputs. Flow Orchestration is meant for orchestrating multiple flows and does not specifically cater to bulk record updates like Batch Apex does.