Explanation
Using a visualforce override or a custom LWC override for Opportunity view action will require additional development and maintenance, and may not be compatible with all devices. The best option is to use Dynamic Form to define different field sections applicable for different form factors of devices, as Dynamic Form is a declarative feature that allows admins to customize record detail pages without writing code.

Field-level security (FLS) defines which fields a user can view or edit. If a user can see some fields (like Name, Created Date, etc.) but not others, the issue is likely related to FLS settings on the user's profile.
* Option A: Role-based sharing rules control record access, not field access.
* Option B (Correct): The Sales User profile likely lacks FLS access for the fields in question. Adjusting the profile or permission sets to grant visibility to these fields will resolve the issue.
* Option C: Page layouts define which fields are displayed but cannot override field-level security. If the profile lacks FLS access, the fields won't appear regardless of the layout.
References:
* Field-Level Security Overview

Field-Level Security (FLS) is the most secure and efficient method to restrict visibility of sensitive fields like the VIP Flag to specific user groups or profiles. FLS is applied at the field level, ensuring that users who lack permission cannot view, edit, or access the field, regardless of the sharing or page layout configurations.
* Option A: Changing the field type to a picklist and using record types unnecessarily complicates the solution. Record types are typically used for different business processes, not for field-level security.
* Option B: Using page layouts restricts visibility on the UI but doesn't secure the field from API or report-level access. Users with access to the object could still retrieve the field's data.
* Option C: Setting FLS ensures that the field is hidden everywhere it appears (e.g., UI, reports, APIs) for all profiles except the Private Banking Rep Profile. This is the most effective and Salesforce- recommended method for sensitive data control.
References:
* Field-Level Security Overview
* Best Practices for Securing Sensitive Data

The Partner Community license is designed for use cases requiring access to Opportunities, Campaigns, Leads, and other sales-related records. In this scenario:
* Distributors need to use the community to see closing Opportunities.
* The Partner Community license is optimized for external users involved in a sales process, like distributors, and offers full access to the Opportunity object.
* Option A: Customer Community Plus provides limited access to objects and is not suitable for collaboration on sales records like Opportunities.
* Option C: Customer Community licenses are insufficient because they don't support access to Opportunities.
References:
* Community Licenses Overview