Which of the following is a reasonable way to select the number ofprincipal components "k"?

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Question:Which of the following is a reasonable way to select the number ofprincipal components "k"?

1.Choose k to be the smallest value so that at least 99% of the varinace is retained.

2.Choose k to be 99% of m (k = 0.99*m, rounded to the nearest integer).

3. Choose k to be the largest value so that 99% of the variance is retained.

4. Use the elbow method.

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  1. Which of the following is a reasonable way to select the number ofprincipal components "k"?
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