Which of the following acts as a strong reducing agent? (Atomic number : $Ce=58, Eu=63$, $Gd=64, Lu=71$)
(1) $Lu^{3+}$
(2) $Gd^{3+}$
(3) $Eu^{2+}$
(4) $Ce^{4+}$
$Eu^{+2}$
$[Xe] 4 f^{7} 6 s^{0} Eu^{+3}+1 e^{-}$
$[Xe] 4 f^{6} 6 s^{0}$
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