Please answer all the questions, thank you.

2. (5pt) Representations of numbers: 12, 21 2. A Write down the values in Binary, Octal, and Hexadecimal systems. 2.B Represent the values as 8-bit unsigned integers, with the first bit for odd parity. 2.C Represent the values in BCD. 2.D Represent the values as 8-bit unsigned integers, also write down their unsigned 2s complements. 2.E Represent the NEGATIVE values of these numbers in 8-bit signed, also write down their SIGNED 2s complements