Following are the steps to determine the internal resistance of a given primary cell using the potentiometer. Arrange the steps in sequential order.

(A) Keep the readings in the ammeter constant throughout the observation.
(B) Connect different electrical components. After checking the circuit connections close key $K_1$.
(C) Take $R=10Ω$ (from $R_{Box\, 1}$). Close $K_2$ and quickly managed the new balance length $l$. Open $K_2$ after this.
(D) Reduce the value of R is equal steps of 1 Ω and obtain $l$ for each R.

Choose the correct answer from the options given below:

(B), (C), (A), (D)

The correct answer is Option (3) → (B), (C), (A), (D)