What are two advantages gained by using IBM Cloud as the application platform for an application using Watson services? (Choose two.)

What are two advantages gained by using IBM Cloud as the application platform for an application using Watson services? (Choose two.)
A . IBM Cloud is built on proprietary APIs which provide competitive advantages
B . The IBM Cloud application developer can choose among multiple release versions of the Cloud Foundry framework
C . IBM Cloud promotes 12-factor methodology since IBM Cloud is deployed exclusively as a public cloud model
D . Environmental, operational, and functional Security are built into the IBM Cloud platform
E . Scaling application capacity is simple for applications following modern design (such as 12-factor methodology)

Answer: BD