Which groundbreaking feature did Mathematica introduce in its 1988 initial release that revolutionized computational mathematics software development?

Mathematics software has dramatically transformed how we teach, learn, and apply mathematical concepts. From basic calculators to sophisticated computational engines, the development of these products has been shaped by educational needs, technological advancements, and innovative thinking. Test your knowledge about the product development history of mathematical tools that have revolutionized the field.

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Notebook interface that combined text, graphics, and calculations in a single document
Cloud-based computation that allowed sharing of mathematical models
Neural network capabilities for advanced machine learning applications
Open-source community development model with public code repositories