Which of the following equations is an overidentified equation??
A. ?y1=?12y2+?13y3+?11z1+u1
B. ?y2= ?21y1 + ?21z2 + ?23z3 + u2
C. ?y3=?32y1+?31z1+?32z2+?33z3+?34z4+u3
D. ?y1=?10+?1y2+z1?1+u1
Answer: A
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