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1. Suppose we use 4 bits to represent a number. For the same bit pattern, e.g. 1001, if we use different number systems, it could have different meanings. For each of the following four cases, finish these two tasks: 1) Suppose the binary numbers are represented in unsigned form, compute the addition (write the result in 4 bits) and determine if there is overflow. 2) Suppose the binary numbers are represented in 2's complement form, compute the addition (write the result in 4 bits) and determine if there is overflow. Four cases (2.5 pts for each case): A 0011 + 1100 B 0111 + 1111 C 1110 + 1000 D 0110 + 0010