abcD+abcd+aBCd+aBCD
then the simplified function is
( Capital letters are copliments of corresponding letters
A=compliment of a)

[a] a [b] ab [c] abc [d] a(bc)* [e] mone
(bc)*=compliment of bc

Answer Posted / shubh

abcD
+abcd
+aBCd
+aBCD
-------
=4a000
-------

so answer comes is 4a,but it is none of the given option so
answer is [e]

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