\( 8^{*} \). If \( Z_{1}, Z_{2}, Z_{3} \in C \) such that
\[
\left|Z_{1}\right|=\left|Z_{2}\right|=\left|Z_{3}\right|=1 \text { and }
\]
\[
\frac{z_{1}^{2}}{z_{2} z_{3}}+\frac{z_{2}^{2}}{z_{1} z_{3}}+\frac{z_{3}^{2}}{z_{1} z_{2}}+1=0
\]
then the integral values that \( \left|Z_{1}+Z_{2}+Z_{3}\right| \) can attain, is
(1) 1
(2) 2
(3) 3
(4) 4
