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Salesforce Certified Platform Developer II (PDII) · Salesforce
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Scalability: Heroku can handle high traffic and large-scale data processing efficiently. Heroku Connect: Syncs data asynchronously between Heroku and Salesforce, reducing API call limits and improving performance. Best for bulk data ingestion → Can handle millions of records seamlessly. A & C are can't handle bulk due to UI interaction. Web-to-Lead has a daily limit of 500 leads and Apex Web Services also have limits.
A and C are out as these are UI based systems and require input from a user. D is viable and can run automatically in the background, although it would be better to have it using authentication. I can't answer is B is correct or not. https://developer.salesforce.com/blogs/developer-relations/2012/02/quick-tip-public-restful-web-services-on-force-com-sites
It's possible that B is definitely correct: "The most common use case with Heroku and Salesforce is to provide a high-throughput, low-latency interface for customer-facing applications built with open-source technologies." Source: https://trailhead.salesforce.com/content/learn/modules/salesforce_heroku_integration/getting_started_with_integration In 2023, it's more likely it will ask about Mulesoft than Heroku, or at least equal to.