A politician who is running for the office of mayor of a city with 25,000 registered voters

Question:

A politician who is running for the office of mayor of a city with 25,000 registered voters commissions a survey. In the survey, 48% of the 200 registered voters interviewed my they plan to vote for her.
a. What is the population of interest?
b. What is the sample?
c. Is the value 48% a parameter or a statistic? Explain