If an administrator often needs to manage multiple ECS instances in an Alibaba Cloud VPC through the Internet.

If an administrator often needs to manage multiple ECS instances in an Alibaba Cloud VPC through the Internet.

Which of the following solutions can meet this need at low costs and without affecting system security. (Single answer)
A . Modify the VPC Security Group policy, to allow access from the Internet.
B . None of these answers are correct.
C . Bind an EIP to each of the ECS instances, and log on to each of these ECS instances to manage them.
D . Choose an ECS instance from VPC and make it as the bastion host. And then, apply an EIP and bind it to this ECS instance. After that, the administrator can manage other ECs instances through this bastion host.

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Answer: D