Simulate your design in Proteus. 4. Design a combinational logic circuit which will aid in determining the acceptability of emergency blood transfusions. It is known that human blood can be categorized into four types-A, B, AB, and O. Persons with type A blood can donate to both A and AB types, and can receive blood from both A and O types. Persons with type B blood can donate to both B and AB and can receive from both B and types. Persons with type AB blood can donate only to type AB but can receive from any type. Persons with type o blood can donate to any type but can receive only from type 0. Make appropriate variable assignments and design a circuit which will approve or disapprove any transfusion based on these conditions. Simulate your design in Proteus