Which of the following are characteristics of Amazon VPC subnets?

Which of the following are characteristics of Amazon VPC subnets?
Choose 2 answers

A.
Each subnet maps to a single Availability Zone

B.
A CIDR block mask of /25 is the smallest range supported

C.
Instances in a private subnet can communicate with the internet only if they have an Elastic IP.

D.
By default, all subnets can route between each other, whether they are private or public

E.
V Each subnet spans at least 2 Availability zones to provide a high-availability environment