what should be correct according to gate PYQs?
https://gateoverflow.in/669/gate-cse-2000-question-2-22
https://gateoverflow.in/2122/gate-cse-2011-question-20-ugcnet-june2013-ii-48
https://web.cs.ucla.edu/~ani/classes/cs111.08w/Notes/Lecture%2016.pdf (Slide # 13)
References.
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