A poll finds that 54% of the 600 people polled favor the incumbent. Shortly after the poll is taken, it is disclosed that the incumbent had an extramarital affair. A new poll finds that 50% of 1030 people polled now favor the incumbent. The standard error for a confidence interval for the candidate's latest support level is

a. 0.016.
b. 0.00025.
c. 0.020.