Which 2 architectures are enabled by using a single Private Space and the Internal Routing feature?

Which 2 architectures are enabled by using a single Private Space and the Internal Routing feature?
A . A microservices architecture that also uses DNS ServiceDiscovery to facilitate communication
B . Multiple public-facing web apps with different sets of trusted inbound IP ranges
C . A single public-facing web app that performs network-isolated communication with multiple non-public-facing web apps.
D . Network-isolated communication between applications in the Private Space and applications in the Common Runtime

Answer: A,C

Explanation:

https://devcenter.herokuxorn/articles/event-driven-microservices-with-apache-kafka