The number of distinct real values of $\lambda$, for which the vectors ${\lambda }^2\hat{i}+\hat{j}+k,\hat{i}-{\lambda }^2\hat{j}+\hat{k}and\hat{i}+\hat{j}-{\lambda }^2\hat{k}$are coplanar isa. zero b. one c. two d. three

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