1) What is the 2's complement of the 4-digit binary number 0110?

a. 1010

b. 1011

c. 1100

2) What is the binary 8-bit 2's complement of the decimal number 39?

a. 10111101

b. 11101101

c. 11011001

3. Which of the following is true regarding variables.

a. Variables cannot be reused

b. The value of a variable can be changed by using the assignment operator =

c. Variables can only be assigned with numbers