In the context of the lanthanoids, which of the following statement is not correct?

(a) There is a gradual decrease in the radii of the members with increasing atomic number in the series.

(b) All the members exhibit a +3 oxidation state.

(c) Because of similar properties, the separation of lanthanoids is not easy.

(d) Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.

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