I need answers for these two questions please! computer architecture class

Question 1 identify a true statement about two's complement representation.

A-Two's complement representation inverts every bit of the binary number and adds 0 to the number

B-Two's complement representation multiplies the binary number by 2

C-Two's complement representation inverts every bit of a binary number and adds 1 to the number

D-Two's complement representation divides the binary number by 2

Question 2

Which addition results in an overflow?

A- 1001 + 0010

B- 1010 + 1001

C- 0011 + 0001

D- 0110 + 1000