a= 1110 1100 0111

b= 1010 0110 0101

c= 0110 1010 1011

[20 points] Assuming a, b, and c from problem 4, compute the following using binary opera- tions assuming 12-bit two's complement, and arithmetic shift where necessary. Express your final answers in both binary and hexadecimal. Also, state whether each involves a positive overflow, a negative overflow, or no overflow. a. a + b b. (a > 3) + b d. b-c (c-a)