3. 2s complement representation a. What is the range of 2s complement representation of a binary (i) 4-bit (ii) 8-bit (iii) 16-bit strings. What is the range of unsigned numbers for the same set of bit strings? b. Negate the following 4-bit, 8-bit and 16-bit strings and verify your solution by adding the original bit string to its 2s complement: (i) 0110 (ii) 1000 0101 (iii) 01111001 0110 1011 4. Addition of Signed & Unsigned numbers Add the following 8-bit strings assuming they are (i) unsigned (ii) signed and represented using 2's complement. Indicate which of these additions overflow. A. 0110 1110 + 1001 1111 = B. 1111 1111 + 0000 0001 = C. 1000 0000 + 0111 1111 = D. 0111 0001 + 0000 1111 =