Calculating Standard Deviation from Daily Steps Data

A researcher has collected data on the daily number of steps taken by a sample of 15 participants over a month. The data collected is as follows:

3500, 4500, 7000, 12000, 5000, 8000, 8100, 9000, 3000, 6700, 11000, 6400, 5600, 7500, 5000

Using this dataset, calculate the standard deviation of the daily steps taken by the participants. Which of the following options is the closest approximation of the standard deviation?