2. Two's complement concepts. ( 3 pts, 1pt for each question mark) a. How many characters can be covered by 4-byte encoding (in 2's powers)? b. We term 8-bit as a byte and 16-bit as a word. If 2's complement representation uses a word, what range does it cover? c. To represent signed integers, we first adopted an idea to encode them by a bit of sign concatenated with the binary sequence of the absolute value. We name it as True Value representation. Eg. to encode 5 in a byte, we concatenate ' 1 ', which is the sign and 0000101, which is the abs (5) to represent it as 10000101 . Then we introduce another representation, 2 's complement representation and think that it is superior to True Value. Why