Someone Is Creating a VPC for Their Application Hosting

Someone is creating a VPC for their application hosting. He has created two private subnets in the same availability zone and created one subnet in a separate availability zone. He wants to make a High Availability system with an internal Elastic Load Balancer. Which choice is true regarding internal ELBs in this scenario? (Choose two.)

A) Internal ELBs should only be launched within private subnets.
B) Amazon ELB service does not allow subnet selection; instead it will automatically select all the available subnets of the VPC.
C) Internal ELBs can support only one subnet in each availability zone.
D) An internal ELB can support all the subnets irrespective of their zones.