(d) [3 marks] Now suppose that the BCD checker circuit is to bemodified to be used as a module in a larger n-bit BCD checker designcapable of checking if the input of an n-bit number is a valid BCDcode, where n is a multiple of 4. Modify the circuit in part (c)using additional logic gates to yield a new module that has anadditional input BCDin as shown in the figure below
such that the output BCDout is 1 if and only if the 4-bit inputA3A2A1A0 is a valid BCD code AND the input BCDin is 1. Show howseveral of these new
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