Answer:
D. have multiple circuits and are placed in individual cases.
Step-by-step explanation:
Integrated circuits use semi conductor technology. Silicon is used as the base material generally.Thin wafers of square or rectangular shape are cut out of a silicon crystal and the process of masking, etching, doping and testing are all done before the chips that are working are cut out of the wafers and are packed into individual plastic cases for their use in the digital and electronic equipment.