Answer: Use the transfer tool for unmanaged user accounts.

The correct answer is C because the transfer tool for unmanaged user accounts is specifically designed to handle consumer accounts created with a corporate domain. This tool allows administrators to identify these unmanaged accounts and invite users to transfer them to the organization's managed Cloud Identity, preserving their data and access. Option A (Google Cloud Directory Sync) is incorrect as it synchronizes existing directory users rather than converting consumer accounts. Option B (creating new managed accounts) would result in duplicate accounts and potential data loss. Option D (SSO configuration) does not address the core issue of converting existing consumer accounts to managed ones. The community discussion strongly supports C with 94% consensus and multiple references to official Google documentation confirming this approach.

Author: LeetQuiz Editorial Team