What configuration option ensures sales representatives see essential fields to complete prior to saving an Opportunity?

The configuration option that ensures sales representatives see essential fields to complete prior to saving an Opportunity is the requirement for fields on the Page Layout. When fields are marked as required within the Page Layout settings, users cannot save the Opportunity record until they have filled in those fields. This ensures that important information is collected, promoting data completeness and accuracy in the opportunity management process.

By using required fields in the Page Layout, you define the mandatory information that sales representatives must provide during the opportunity creation or editing process. This is a user-friendly approach that guides sales reps through the necessary steps without requiring additional validation settings or custom configurations.

Other options, such as Validation Rules, while useful for enforcing specific data integrity checks, may not necessarily ensure fields are seen upfront since they can trigger upon saving rather than during data entry. Dependent Picklist Fields and Field-level Security also serve different purposes related to data visibility and access but do not directly focus on ensuring that essential fields are filled before saving a record.