Which is not the correct statement? (At. nos. $Ce = 58, Lu = 71, La = 57, Yb = 70$)
- AColour of $Yb^{3+}$ ion is pink.
- B$La^{3+}$ is diamagnetic.
- C$Ce^{4+}$ has $f^0$ configuration.
- D$Lu^{3+}$ has $f^{14}$ configuration.
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