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The TTL circuit shown in the figure given below is fed with the waveform X (also shown). All gates have equal propagation delay of 10 ns. The output Y of the circuit is
Correct Option: A
At point 1, γ1 = X.X = X delayed 10 n sec.
γ2 = X. X = X= x delayed 20 n sec.
Due to 10n sec propagation delay, it will take 10 n sec at ON and 10 n sec at OFF 
2 i.e. output is high only when one input high and other is low.
