What are the functions of Chinese knots in Chinese history? A: For keeping records B: For fastening and wrapping C: For ornamental functions D: For enhancing festive atmosphere

land ( ) A: a person who is owned by and forced to work for another with no pay or rights. B: to kill by fastening a rope tied around the neck to a point above and removing all support. C: the act of giving or getting one thing in return for another; trade. D: the solid part of the earth's surface.