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a) What are the basic three forms of market efficiency? b) On May 18, 2020, Modema Inc announced positive results on its vaccine against Covid19,

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a) What are the basic three forms of market efficiency? b) On May 18, 2020, Modema Inc announced positive results on its vaccine against Covid19, the market index S\&P500 jumped from 2,863 to 2,913 in the morning, and closed at 2.953 in the afternoon. Based on this information, which form of market efficiency do you think U.S. stock market is likely to belongs to and why

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