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A company is planning to launch a new online service targeting consumers directly (B2C). They aim to provide a highly customized user experience, including personalized login pages and the ability for users to sign in using their preferred social media accounts. The company also prioritizes security, requiring multi-factor authentication (MFA) and compliance with global data protection regulations. Additionally, they want the solution to be scalable to accommodate millions of users worldwide without significant infrastructure changes. Considering these requirements, which Azure service should the company use to meet these needs? (Choose the best option from the following four options.)