A sales rep has a list of 300 accounts with contacts that they want to...

The Data Import Wizard is the most efficient and user-friendly tool for importing a relatively small number of records (up to 50,000) when those records involve standard objects like Accounts and Contacts simultaneously. A key advantage of this tool is its built-in capability to handle " Account and Contact " imports in a single pass, which includes automatic matching to prevent duplicates based on name or email. For a volume of 300 records, the browser-based wizard is much faster to set up than the Data Loader, as it does not require a separate installation or complex CSV mapping for simple standard objects. While the Data Loader (Option D) and Dataloader.io (Option C) can handle this volume, they are typically preferred for much larger datasets (up to 5 million records) or more complex custom objects. The " Wizard " provides a guided experience that is ideal for sales reps or administrators performing routine data entry tasks.