There are only two ways to tell somebody thanks: Kudos and Marked Solutions Unofficial Forum Rules and Guidelines "Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
The answer is D (1111 1111). You take the two's compliment of -1 (1 = 0000 0001 -> the compliment gives-> 1111 1110 -> adding 0001 gives the your answer = 1111 1111).