Which of the following provides a collection of prebuilt machine learning models offered as APIs for common tasks?

Azure Cognitive Services is a suite that provides a collection of prebuilt machine learning models accessible through APIs, specifically designed to handle common tasks such as vision recognition, natural language processing, speech recognition, and more. This allows developers to integrate advanced algorithms into their applications without needing extensive knowledge of data science or machine learning model training. By utilizing these APIs, users can improve their applications' capabilities rapidly and efficiently, leveraging the power of AI without the overhead of creating and training models from scratch.

In contrast, Azure Synapse Analytics primarily focuses on data integration, data warehousing, and analytics using big data tools. Azure Databricks, while a powerful collaboration platform for data science and analytics, primarily enables data engineers and data scientists to build and train models rather than providing prebuilt solutions. Azure Machine Learning Studio offers capabilities for building, training, and deploying machine learning models but does not specifically concentrate on providing a collection of prebuilt models as APIs for end-users.