3d plotting keywords

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I would love to know how to see all of the optional keywords in Sage Functions. For example, when searching for implicit_plot3d keywords, I tried using help(), tried going all over a Google Search, and tried going to the Sage documentation, but I could only find a partial list. Some of the examples used a keyword called "gradient", yet I could not find this in any keyword list for the function. Is there a way that I can take any Sage function, and see all of the optional keywords?