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Which of the following statements about ECS, VPC, security groups are NOT true? (the number of correct answers: 2)

Which of the following statements about ECS, VPC, security groups are NOT true? (the number of correct answers: 2)
A . rule setting for security group supports both in and out direction configuration
B . default security group rule is safe enough, please don’t change it too much
C . by default, ECS in different security group can communicate with each other
D . one ECS can be in several different security group

Answer: B,C

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