A company needs to implement identity management for a fleet of mobile (CLF-C02)

Correct answer: A. Amazon Cognito.
Amazon Cognito is the AWS service that will meet the requirement for implementing identity management for a fleet of mobile apps running in the AWS Cloud.

Amazon Cognito is a fully managed identity service that provides user sign-up, sign-in, and access control functionality for mobile and web applications. It supports user authentication through various identity providers, including social media platforms, SAML, and OIDC, as well as allowing users to sign in directly with a username and password.

Amazon Cognito is designed to handle the complexities of managing user identities and authentication for mobile and web applications, making it a suitable choice for the company's requirement to implement identity management for their fleet of mobile apps running in the AWS Cloud.

The other options are not the correct answers:
B. AWS Security Hub: This service provides a comprehensive view of a customer's security state within AWS and helps detect and prioritize security alerts, but it does not provide identity management functionality.
C. AWS Shield: This service provides DDoS protection for web applications running on AWS, but it does not handle identity management.
D. AWS WAF: This service is a web application firewall that helps protect web applications from common web exploits, but it does not provide identity management capabilities.