What allows you to conveniently switch between multiple instances of a single configuration within its single backend?

What allows you to conveniently switch between multiple instances of a single configuration within its single backend?
A . Local backends
B . Providers
C . Remote backends
D . Workspaces

Answer: D

Explanation:

Named workspaces allow conveniently switching between multiple instances of a single configuration within its single backend. … A common use for multiple workspaces is to create a parallel, distinct copy of a set of infrastructure in order to test a set of changes before modifying the main production infrastructure.

Workspaces, allowing multiple states to be associated with a single configuration. The configuration still has only one backend, but multiple distinct instances of that configuration to be deployed without configuring a new backend or changing authentication credentials.

https://www.terraform.io/docs/state/workspaces.html