What is true about primary statistical sources for Delaware?

• Primary agencies such as the U.S. Census Bureau and Bureau of Economic Analysis are used only for historical fiction
• Primary agencies such as the U.S. Census Bureau and Bureau of Economic Analysis are preferred for changing demographic and economic statistics
• Primary agencies such as the U.S. Census Bureau and Bureau of Economic Analysis are less reliable than unsourced social-media posts
• Primary agencies such as the U.S. Census Bureau and Bureau of Economic Analysis are unnecessary when statistics change over time