12. A 3 × 3 table is divided into 9 unit squares, and two circles are inscribed in two of them (see the figure).
What is the distance between the two circles? (A distance between figures is the shortest distance
between any two points on the two figures.)
(A) 2√2 − 1 (B) √2 + 1 (C) 2√2 (D) 2 (E) 3
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