TTL PCB design - Decoupling capacitor to remove ground & supply line noise

Q.  Which among the below stated devices/equipments are preferred for elimination of  ground and supply line noise especially in TTL/CMOS / ECL PCB designing?
- Published on 25 Sep 15

a. Coupling capacitor
b. Decoupling capacitor
c. Snubber circuits
d. All of the above

ANSWER: Decoupling capacitor

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