What is necessary to create a round part in synchronous mode?

To create a round part in synchronous mode, one effective method involves manipulating geometry by dragging to an edge and selecting the torus. This allows users to directly engage with the existing geometry to create a rounded feature, which is essential when designing parts that require smooth transitions or circular shapes.

In synchronous mode, the ability to directly manipulate features by dragging makes it easier to create complex shapes without needing to use more structured workflows that might be required in traditional modeling environments. By selecting edges and applying a toridal shape, users can quickly achieve the desired roundness with a smooth and efficient process.

The other options do not address the creation of a round part in the same direct manner. Selecting a bolted assembly relates to assembly features rather than part creation. Utilizing the cutout feature would suggest modifying an existing geometry rather than creating a round part from a solid. Selecting a solid cube from the library is more about starting geometry rather than specifically creating a round feature. As such, the most suitable answer revolves around the dynamic manipulation and application of features to achieve the design requirements in synchronous mode.