51. Which of the following is true of the LoB when it opens?

(A) a, b, d
(B) a, c, e
(C) b, c, d
(D) b, d, e
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統計: A(0), B(0), C(1), D(0), E(0) #484839
統計: A(0), B(0), C(1), D(0), E(0) #484839