Of the following searches for extraterrestrial radio signals, which one has detected a signal from an extraterrestrial intelligence?   a. META: Mega-channel Extra-Terrestrial Assay   b. SERENDIP: Search for Extraterrestrial Radio Emission from Nearby Developed Intelligent Populations   c. SETI: Search for Extra-Terrestrial Intelligence   d. VLASETI: Very Large Array Search for Extra-Terrestrial Intelligence   e. none of the above

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