Select the true statement about the mechanism of action of a natural killer cell.
A. Granzymes from the natural killer cell enter the perforin hole and degrade the enemy cell enzymes.
B. The enemy cell dies by apoptosis, and the macrophage engulfs and digests the dying cell.
C. The natural killer cell releases perforins that form a hole in the enemy cell membrane.
D. All of these are correct.
Answer: D
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