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The correct methodology for a data migration project follows a logical, phased approach to minimize risk and ensure data integrity. The process begins with Planning, which involves defining the scope, strategy, and data mapping. Next is Preparation, where data is extracted, cleansed, and transformed. A critical Test phase follows, using a subset of data in a sandbox to identify and fix issues before the main event. The Execute phase is the full data migration into the production environment. Finally, Validate confirms that the data in the new system is accurate, complete, and meets business requirements.

A. Prepare, Plan, Test, Validate, Execute: Planning must be the initial phase; data preparation cannot logically precede the creation of a migration plan.

B. Plan, Prepare, Execute, Test, Validate: Executing the full migration before testing is extremely risky and contradicts best practices, as it leaves no opportunity to fix systemic issues found during a test run.

1. Salesforce Architects, Architect's Guide to Data Migration: The guide outlines the key phases of data migration. It describes the process starting with "Strategy and Planning," followed by "Preparation" (including extraction, transformation, and cleansing), then "Testing and Validation" (which includes multiple test cycles), and finally "Migration Execution." This aligns with the sequence Plan, Prepare, Test, Execute, and Validate. (Source: architect.salesforce.com, "Architect's Guide to Data Migration," Phases of Data Migration section).

2. Salesforce Trailhead, Data Management Module: The "Import and Export with Data Management Tools" unit implicitly follows this structure. It emphasizes understanding data structure and preparing files (Plan, Prepare), using tools to import (Execute), and checking results (Validate). The best practice of testing in a sandbox first is a core Salesforce recommendation. (Source: Trailhead, Data Management module, "Import and Export with Data Management Tools" unit).

3. Salesforce Help, Data Migration Tips and Tricks: This official documentation advises, "Before you begin your migration, you should have a plan." It then details steps for data preparation and strongly recommends, "Test your migration in a sandbox environment before you attempt to migrate into a production organization." This supports the sequence of Plan -> Prepare -> Test -> Execute. (Source: Salesforce Help, Article Number 000383318, "Data Migration Tips and Tricks").