What is the expression for Thevenin's current if there is an external resistance in series with the Rth?

What is the expression for Thevenin's current if there is an external resistance in series with the Rth?

  1. a) Vth/Ith
  2. b) Vth/ (Rth-R)
  3. c) Vth/ (Rth+R)
  4. d) Vth/Rth

From the BUET MSC (ICT) July 2021 – MCQ exam, question 52 of 57.

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