If R2 = RC RA / (RA +RB +RC ) then R3equals?

(a) RA RB / (RA +RB +RC )

(b) RC RA / (RA +RB +RC )

(c) RB RC / (RA +RB +RC )

(d) RX RA / (RA +RB +RC )

This question was posed to me in unit test.

My question is taken from Measuring Resistance the Wheatstone Bridge and Delta-to-Wye (Pi-to-Tee) Equivalent Circuits topic in chapter Simple Resistive Circuits of Electric Circuits

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