What command will allow you to quickly create the other half of a symmetric part model?

The command that allows you to quickly create the other half of a symmetric part model is the option focused on the 'Mirror Body.' When working with symmetric parts in Siemens NX, mirroring is an essential functionality that enables efficient modeling by duplicating existing features across a defined plane of symmetry.

When you utilize the 'Mirror Part' command, it takes the entire part and mirrors it to create a copy on the opposite side of the symmetry plane. This is particularly useful for complex parts where symmetry is inherent.

In contrast, the 'Mirror Feature' command allows for individual features to be mirrored rather than the entire part, which can be useful in certain modeling situations but doesn't provide the same level of comprehensive replication as the entire part mirror.

The 'Extract Geometry' commands focus more on picking existing geometry and transforming it, rather than directly creating a mirrored counterpart of a model. While they are useful for obtaining features or bodies, they don't serve the specific need of creating a symmetric counterpart as efficiently as the mirror functions do.

Therefore, choosing the command that explicitly mentions 'Mirror Body' indicates the focus on creating a direct symmetrical counterpart, making it the correct choice for rapidly producing the other half of a symmetric part model.