Answer: You can not specify publicly routable IP addresses to an ALB, An ALB has three possible target types: Instance, IP and Lambda

An ALB has three possible target types: Instance, IP and Lambda When you create a target group, you specify its target type, which determines the type of target you specify when registering targets with this target group. After you create a target group, you cannot change its target type. The following are the possible target types: Instance - The targets are specified by instance ID IP - The targets are IP addresses Lambda - The target is a Lambda function You can not specify publicly routable IP addresses to an ALB When the target type is IP, you can specify IP addresses from specific CIDR blocks only. You can't specify publicly routable IP addresses. Incorrect options: If you specify targets using an instance ID, traffic is routed to instances using any private IP address from one or more network interfaces - If you specify targets using an instance ID, traffic is routed to instances using the primary private IP address specified in the primary network interface for the instance. If you specify targets using IP addresses, traffic is routed to instances using the primary private IP address - If you specify targets using IP addresses, you can route traffic to an instance using any private IP address from one or more network interfaces. This enables multiple applications on an instance to use the same port. An ALB has three possible target types: Hostname, IP and Lambda - This is incorrect, as described in the correct explanation above.

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