4 is CORRECT. (153)10 = (231)8, by dividing 153 by 8 three times and recording the remainders: 153/8 = 19 with r = 1; 19/8 = 2 with r = 3; 2/8 = 0 with r = 2. Stop here because 0 was reached. Read the r numbers backwards to get 231.
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