Which innovative product development decision by Wolfram Research in 1988 revolutionized computational mathematics by introducing a unified symbolic computing environment?

The development of mathematical software has transformed how students learn and how professionals solve complex problems. From basic calculators to sophisticated computational platforms, these products have evolved dramatically over decades. This trivia question focuses on a pivotal product development decision that changed the landscape of mathematical computing and education.

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Creating Mathematica with a notebook-based interface that combined text, calculations, and visualizations
Developing the first cloud-based calculator application with subscription pricing
Launching the first graphing calculator with touchscreen capabilities
Releasing the first open-source statistical computing platform with built-in programming language