Analog Electronics
To prevent a DC return between source and load, it is necessary to use

Capacitor between source and load
Resistor between source and load
Inductor between source and load
Either A or B

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  single - ended input and differential output.
  differential input and single - ended output.
  differential input and differential output.

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