单项选择题
A.ApacheB.HTTPC.FTPD.NTP
A.MSSOLB.MySOLC.AuroraD.DB2
A.弹性和弹性MapReduceB.RDS和DynamoDBC.EC2及弹性MapReduceD.Elasticache和DynamoDB
A.CloudFrontB.边缘区域C.LambdaEdgeD.分配
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