Which of the following statements is true about Banach spaces? a) A Banach space is a complete normed vector space. b) A Banach space must be finite-dimensional. c) In a Banach space, every Cauchy sequence converges to an element outside the space. d) A Banach space is a vector space equipped with an inner product.

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A: here we can use linear combination to prove that given set is linearly independent.

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A: (b)

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