What are some of the benefits of using a Spartacus storefront to do this?

You are implementing SAP Commerce Cloud for your B2B customers .

What are some of the benefits of using a Spartacus storefront to do this? Note: There are 3 correct answers to this question.
A . Progressive Web app (PWA)
B . Extensibility
C . Coupled platform
D . All Web browsers are supported.
E . Upgradable components

Answer: A,B,E