Question: Which answer is true? a.All principal components are unique up to a sign change. b. The first principal component is unique up to a sign

Which answer is true?

a.All principal components are unique up to a sign change.

b. The first principal component is unique up to a sign change.

c.The last principal component is unique up to a sign change.

d. If some features are correlated, at least one singular value is zero.

e. If some features are linearly dependent, at least one singular value is zero.

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