A New York Times article reported that a survey conducted in $2014$ included $$adults$,$ with $\%$ of them being regular users of$$ e$-$cigarettes. Because$$ e$-$cigarette use is relatively$$ new, there is a need to obtain$$ today's usage rate. How many adults must be surveyed now if a confidence level of $\%$ and a margin of error of percentage are$$ wanted? Complete parts$($a$)$ through$($c$)$ below.

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Part $1$

a$.$ Assume that nothing is known about the rate of$$ e$-$cigarette usage among adults.

n

$$

enter your response here

$($Round up to the nearest$$ integer.$)$

Part $2$

b$.$ Use the results from the $2014$ survey.

n

$$

enter your response here

$($Round up to the nearest$$ integer.$)$

Part $3$

c$.$ Does the use of the result from the $2014$ survey have much of an effect on the sample$$ size?

A$.$

$$No$,$ using the result from the $2014$ survey does not change the sample size.

B$.$

$$No$,$ using the result from the $2014$ survey only slightly reduces the sample size.

C$.$

$$Yes$,$ using the result from the $2014$ survey only slightly increases the sample size.

D$.$

$$Yes$,$ using the result from the $2014$ survey dramatically reduces the sample size.