If the papers of 4 students can be checked by any one of the 7 teac...

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If the papers of 4 students can be checked by any one of the 7 teachers, then the probability that all the 4 papers are checked by exactly 2 teachers, is equal to
(A) \( \frac{12}{49} \)
(B) \( \frac{6}{49} \)
(C) \( \frac{9}{49} \)
(D) \( \frac{15}{49} \)
\( \mathrm{P} \)
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