How does Magento store the IDs of updated products for reindex in "Update on Schedule" mode?

You are working on a project where many catalog managers often change products in the admin panel.

The merchant is considering changing the indexers mode to "Update on Schedule" from "Update on Save" to achieve better performance. However, the merchant is concerned about data consistency and the probability of the scheduled updates being lost.

How does Magento store the IDs of updated products for reindex in "Update on Schedule" mode?
A . Magento is gathering updated IDs using catalog_product_save_commit_after events and publishes them into the Message Queue.
B. Magento sets a reindex_required flag on updated products and a later reindex run by the cron will pick up IDs based on that flag.
C. Using the Staging update scheduled for every minute, which includes modified products, Magento will automatically reindex affected products when the update is applied.
D. Magento enables database triggers which collect updated IDs and saves them in special changelog tables.

View Answer

Answer: C