Which one of the empirical formula is used for predicting transmission length?

Which one of the empirical formula is used for predicting transmission length? Correct Answer Lt = ((fcu)1/2 x 103/β)1/2

The transmission length is predicted generally using the following empirical formula, Lt = ((fcu)1/2 x 103/β)1/2, Lt = transmission length in mm, fcu = cube strength of concrete at transfer in n/mm2, β = constant depends on the strand and wire, the transmission length changes with time due to the effect of creep and shrinkage of the concrete.
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