The correct answer is Platform as a Service.

Platform as a Service refers to a managed platform where the provider assumes responsibility for the runtime, middleware and platform operations and it often includes managed services such as databases. In the scenario each Contoso Data Service handles configuration, day to day management, software updates and security for the databases it hosts which aligns with the platform responsibilities a PaaS provider performs.

Platform as a Service lets customers focus on their applications and data while the provider manages the underlying platform and shared services like backups, patching and security. That is why a collection of managed data services is categorized as PaaS rather than a lower level or end user service model.

Infrastructure as a Service is incorrect because IaaS supplies virtualized compute, storage and networking while customers retain responsibility for operating systems, middleware and database management. The scenario describes provider managed updates and security which goes beyond IaaS.

Database as a Service is incorrect in this question because DBaaS normally names specific managed database offerings. The prompt points to a broader platform of data services that manage multiple platform level responsibilities, so the intended category is PaaS rather than a narrowly focused DBaaS label.

Software as a Service is incorrect because SaaS delivers complete end user applications that are consumed directly by users and it does not describe a platform that hosts and manages database services for customers to build and run their own applications on.

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