Correct Answer: Option D

Explanation

Convert each value to decimal (base 10)

\(1011_{two}\) → 11

+ \(1101_{two}\) → 13

+ \(1001_{two}\) → 9

- \(111_{two}\) → 7

: 11 + 13 + 9 - 7 = 26

26 → \(11010_{two}\)

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