Recall the form of a theory-based confidence interval for a population proportion is p multiplier

Question:

Recall the form of a theory-based confidence interval for a population proportion π is
p̂ ± multiplier × √p̂ (1 − p̂ / n
a. Increasing the confidence level has what effect, if any, on the midpoint of this interval?

b. Increasing the confidence level has what effect, if any, on the margin of error of this interval?
c. Increasing the sample size, if all else remains the same, has what effect, if any, on the margin of error of this interval?

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