What problem does the MPEG-DASH (Dynamic Adaptive Streaming over HTTP) standard primarily address?

A It defines a single universal compression algorithm intended for all raster image formats B It standardizes how media is segmented and described in manifests so clients can switch between quality levels dynamically based on network conditions, all over standard HTTP infrastructure C It specifies how 3D meshes should be tessellated for real-time game engines D It defines the single color space that every video codec must use