1 cubic foot is typically written as "1 cf" or "1 ft³". It represents a volume measurement, indicating a cube with each side measuring one foot in length.
The other options:
- "1 c" is not a standard unit for volume.
- "1 cc" (cubic centimeter) is a different unit of volume (1 cubic foot is approximately 28,316.8 cc).
- "1 ft" refers to linear feet, not cubic volume.
So, the correct answer for cubic foot is "1 cf."