Which of the following statements is correct regarding $Periplaneta$ $americana$?
- AThe nervous system is located dorsally,consisting of segmentally arranged ganglia joined by a pair of longitudinal connectives.
- BMales possess a pair of thread-like anal styles.
- C$16$ long Malpighian tubules are present at the junction of the midgut and hindgut.
- DThe grinding of food is performed by the mouthparts.
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