Understanding the Scenario:

Editors need to isolate their edits so that changes are not immediately visible to others.

Edits must be reviewed before becoming public, indicating a requirement for a structured approval process.

The organization aims to reduce the number of RDBMS users, which suggests centralized management of access and permissions.

Editing Models Overview:

Branch Versioning: Designed for web-based workflows and does not require direct RDBMS access for each editor. However, edits made in branch versioning are inherently collaborative and are not isolated unless explicitly controlled through a branch-per-user workflow, which adds complexity.

Traditional Versioning:

Supports isolated editing through private versions.

Editors can create their own versions, make changes, and submit them for review by reconciling and posting to the default version.

Direct access to the RDBMS is centralized, reducing the need for individual RDBMS users.

Nonversioned Editing: Does not support isolated edits or versioned workflows, making it unsuitable for this scenario.

Steps to Implement Traditional Versioning:

Register the feature class as versioned in the enterprise geodatabase.

Allow editors to create private versions for making isolated edits.

Implement a workflow for reconciling and posting edits after review.

Reference:

Esri Documentation: Traditional Versioning.

Why the Correct Answer is B: Traditional versioning meets all requirements: it isolates edits, allows for review before posting, and reduces the number of RDBMS users through centralized version management. Branch versioning is web-centric and lacks the structured review process, while nonversioned editing does not support isolation or versioning.