Directory where SEP 12 RU2 clients keeps AV Definitions

Our Engineers are creating new images that include SEP 12 RU2 clients. But they take nearly 4 GB of space. Which directory path holds the SEP AV definitions. That way, they can delete the SEP AV definitions and once the image is deployed, the SEP client can contact the SEPM and download definitions.

The Engineers want to keep the image as small as possible.

Thank you