The lead content of a blood sample was determined using spectrophotometer using the calibration graph technique Consider the following data Y for unknown is 0.277 if (N = 6), Intercept (b) = 0.2593, Stdblank = 0.0037, Xt = 29 ng/L, X calibration curve point = 40 ng/L, Slope (m) = 0.0021, Stdsamples = 0.0669, the lower limit of quantification (LLOQ) Select one Oa.9.76 ng/L D. 222 ng/L OC 126 ng/L d. 17.6 ng/L