Species which give out long and flexible branches, the shoot to be layered is covered with soil at several places to encourage rooting at more than one point is called ___________________?

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Species which give out long and flexible branches, the shoot to be layered is covered with soil at several places to encourage rooting at more than one point is called ___________________?

A. Ground layering
B. Stool layering
C. Serpentine layering
D. Air layering