A user uses Huawei Cloud Elastic Cloud Server to build a business website. The backend uses Huawei Cloud relational database to store business data. When the database is configured correctly, it is found that the business website cannot communicate with the database. Which of the following possible scenarios is wrong?

A user uses Huawei Cloud Elastic Cloud Server to build a business website. The backend uses Huawei Cloud relational database to store business data. When the database is configured correctly, it is found that the business website cannot communicate with the database. Which of the following possible scenarios is wrong?
A . The ECS and the relational database are in two different VPCs, and peer connections are not configured, so they cannot communicate normally.
B . The password of the elastic cloud server is different from the password of the relational database, so normal communication is not possible.
C . The relational database port configured for the business website in the elastic cloud server is wrong and communication cannot be normal
D . The elastic cloud server and relational database are in two different security groups. The security group does not open the connection port, so normal communication is not possible.

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Answer: C