Voltage drop reasons for o/p driving i/p

Q.  If a high logic output drives a logic circuit input, which among the below specified reasons will be responsible in causing a voltage drop into an invalid state?
- Published on 29 Sep 15

a. Positive noise spike greater than VNL
b. Positive noise spike less than VNL
c. Negative noise spike greater than VNH
d. Negative noise spike less than VNH

ANSWER: Negative noise spike greater than VNH

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