The standard mechanical pencil are numbered as:

A. P, P-1, P-2, P-3
B. HB, H, H-1, H-2, H-3, H-4
C. PH, PH-1, PH-2, PH-3
D. PN, PN-1, PN-2, PN-3, PN-4


Answer: A

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