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alibaba-cea-c01_d1_4dc93e3c1361 domain/d1 · medium single

An architect must ensure that an ApsaraDB RDS database and an ECS instance can communicate over the internal network. According to Alibaba Cloud deployment recommendations, what is the essential constraint?

A They must be placed in the same region
B They must be attached to the same security group
C They must use the same instance type
D They must share a public bandwidth allocation

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