Laboratory $B$ is evaluating a method for glucose that the package insert lists as having a SD of $4m\frac{g}{d}L$ at $120m\frac{g}{d}L,$ giving a CV of $3\mathrm{.}0\%.$ The manufacturer says the SD remained the same at higher and lower concentration levels. The lab calculates the effect this SD would have at $50m\frac{g}{d}L$ and $250m\frac{g}{d}L,$ which is:

Select one:

a$.1\mathrm{.}7\%$;$8\mathrm{.}5\%$

b$.1\mathrm{.}2\%$;$6\mathrm{.}2\%$

c$.1\mathrm{.}3\%,7\mathrm{.}0\%$

d$.1\mathrm{.}5\%$;$7\mathrm{.}8\%$