lf you need to make the ECS instances under three VSwitches (inside the same Alibaba Cloud VPC) cannot access to each other, meanwhile, not affecting other Intranet connections in this VPC, what should you do? (Single answer)

lf you need to make the ECS instances under three VSwitches (inside the same Alibaba Cloud VPC) cannot access to each other, meanwhile, not affecting other Intranet connections in this VPC, what should you do? (Single answer)
A . Create three Security Groups, which respectively include all ECS instances under these three VSwitches . First, configure each of these Security Groups to allow access of all CIDR Blocks. Second, configure each of these Security Groups to forbidden the access of CIDR blocks of the other two VSwitches (given this rule with a higher priority than the previous rule).
B. Create three Security Groups, which respectively include all ECS instances under these three VSwitches . First, configure each of these Security Groups to allow access of all CIDR Blocks. Second, configure each of these Security Croups to forbidden the access of CIDR blocks of the other two VSwitches(given this rule with a lower priority than the previous rule).
C. Create one Security Group, which include all ECS instances under these three VSwitches. First, configure each of these Security Groups to allow access of all CIDR Blocks. Second, configure each of these Security Groups to forbidden the access of CIDR blocks of the other two VSwitches (given this rule with a higher priority than the previous rule).
D. None of these answers are correct.

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Answer: A