You have previously deployed an Amazon Web Services (AWS) transit virtual private cloud (VPC) with a pair of FortiGate firewalls (VM04 / c4.xlarge) as your security perimeter. You are beginning to see high CPU usage on the FortiGate instances.
Which action will fix this issue?
Select an option, then click Submit answer.
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Convert the c4.xlarge instances to m4.xlarge instances.
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Migrate the transit VPNs to new and larger instances (VM08 / c4.2xlarge).
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Convert from IPsec tunnels to generic routing encapsulation (GRE) tunnels, for the VPC peering connections.
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Convert the transit VPC firewalls into an auto-scaling group and launch additional EC2 instances in that group.