In which one of the following paris both do not contain any unpaired electrons in \( 4 f \) ? (1...

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In which one of the following paris both do not contain any unpaired electrons in \( 4 f \) ?
(1) \( \mathrm{La}(57), \mathrm{Ce}(58) \)
(2) \( \operatorname{Tm}(69), L u(71) \)
(3) \( L a(57), L u(71) \)
(4) \( \operatorname{Pm}(61), \operatorname{Er}(68) \)
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