The vectors ā, b̄ and c̄ are of the same length. If taken pairwise, they form equal angles. If ā = î + ĵ and b̄ = ĵ + k̂, then what can c̄ be equal to?

I. î + k̂
II. (–î + 4ĵ – k̂)/3

Select the correct answer using the code given below:

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