You are designing a system that has a Bastion host. This component needs to be highly available without human intervention.
Which of the following approaches would you select?

A. Run the bastion on two instances one in each AZ
B. Run the bastion on an active Instance in one AZ and have an AMI ready to boot up in the event of failure
C. Configure the bastion instance in an Auto Scaling group. Specify the Auto Scaling group to include multiple AZs but have a min-size of 1 and max-size of 1
D. Configure an ELB in front of the bastion instance