Where should parentheses be added to make the following expression true? 1 + 1 + 1 * 2 + 3 + 1 = 10

(1 + 1 + 1) * (2 + 3 + 1)

(1 + 1 + 1) * (2 + 3) + 1

(1 + 1 + 1) * 2 + 3 + 1

(1 + 1) + (1 * 2) + (3 + 1)

Answer:
(1 + 1 + 1) * 2 + 3 + 1

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