Write the set $\{ x : x \text{ is a positive integer and } x^2 < 40 \}$ in the roster form.
- A$\{1, 2, 3, 4, 5, 6\}$
- B$\{1, 2, 3, 4, 5\}$
- C$\{0, 1, 2, 3, 4, 5, 6\}$
- D$\{2, 3, 4, 5, 6\}$
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