Which of the following is a billing and account management service?

The correct answer is C. Amazon DevPay.

Amazon DevPay is a billing and account management service that helps developers and businesses manage their Amazon Web Services (AWS) usage. It provides a single interface for managing all AWS billing and payments, and it offers a variety of features to help developers track their usage and costs.

Amazon Elastic MapReduce (EMR) is a cloud-based big data platform that makes it easy to process vast amounts of data using open source tools such as Apache Hadoop and Spark.

Amazon Mechanical Turk is a crowdsourcing marketplace that makes it easy for businesses to outsource tasks to a global workforce.

Multi-Factor Authentication (MFA) is a security feature that requires users to provide two or more forms of identification in order to access a system.

Here is a brief explanation of each option:

• Amazon Elastic MapReduce (EMR) is a cloud-based big data platform that makes it easy to process vast amounts of data using open source tools such as Apache Hadoop and Spark. EMR provides a managed environment for running Hadoop and Spark clusters, and it offers a variety of features to help developers and businesses manage their big data workloads.
• Amazon Mechanical Turk is a crowdsourcing marketplace that makes it easy for businesses to outsource tasks to a global workforce. Businesses can use Mechanical Turk to have tasks such as data entry, image tagging, and transcription completed by workers around the world.
• Multi-Factor Authentication (MFA) is a security feature that requires users to provide two or more forms of identification in order to access a system. MFA can be used to protect systems from unauthorized access, and it is often used in conjunction with passwords to provide an additional layer of security.
• Amazon DevPay is a billing and account management service that helps developers and businesses manage their Amazon Web Services (AWS) usage. It provides a single interface for managing all AWS billing and payments, and it offers a variety of features to help developers track their usage and costs.