How does the "room$-$scale" mode of Virtual Reality $($VR$)$ work?

The user's avatar is automatically re$-$sized to the same scale as the other users in the virtual environment.

The user walks around a physical space and their movements are mirrored in the virtual environment.

The user remains in a fixed location and moves around the virtual environment using hand$-$held controllers.

The user can change the appearance of the virtual room with the settings on their VR device.

I don't know this yet.