What is the purpose of the advanced mode in the Closure compiler?

What is the purpose of the advanced mode in the Closure compiler? Correct Answer Renaming the variables and other parameters

In Advanced mode, the Closure Compiler rewrites the JavaScript by renaming variables and functions from longer descriptive names to single letters to save file size, and it inlines functions, coalescing them into single functions wherever it determines that it can.

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The Closure Compiler was introduced by