Exam Certified Platform App Builder topic 1 question 576 discussion

When importing a list of 25,000 records, the Import Wizard is the most appropriate tool. For custom objects, while it may not offer deduplication directly, it is the more user-friendly option for importing up to 50,000 records. For more we need to use Data Loader

Why not C?

Deduplication: The Import Wizard provides some level of deduplication for standard objects like Leads, Contacts, and Accounts by matching on email or other standard fields. However, for custom objects like your Delivery object, deduplication would rely on matching existing records by a unique identifier or external ID, which is something Data Loader can handle using the upsert operation.

Salesforce's powerful data import and export tool can handle large amounts of data and offers deduplication and other advanced features. When importing a list of 25,000 records, the Data Loader is the most appropriate tool.