Design a BCD code generator that can generate only 6,7,8, and 9 with 4 bits. Hints: Prepare a Truth Table where decimal 0 to 5 equals to ' 0 ', 6 to 9 equals to ' 1 ' and 10 to 15 equals to ' x ' (don't care). Simplify it using K-map, then draw the digital logic circuit using the final simplified expression. 4. Convert the following SOP expression to it's standard format. You can use any method you are comfortable with. a. F=A+BC b. F=A+AB+ABC