Finish the following sentence with the best choice: Secure backing board of barn door to frame.

Choices:
- Spread rubber cement on the back of the frame, and place wood slats next to each other until the frame is covered.
- Spread wood glue on the back of the frame, and place wood slats next to each other until the frame is covered.

Answer:
Spread wood glue on the back of the frame, and place wood slats next to each other until the frame is covered.