Which of the following is the domain of \((a_1,a_2,…,a_n )\) and \((b_1,b_2,…,b_n )\), such that we will always have

\[(a_1^2+a_2^2+⋯+a_n^2 )(b_1^2+b_2^2+⋯+b_n^2 )≥(a_1 b_1+a_2 b_2+⋯+a_n b_n )^2\]

Choose the *most suitable* answer.

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