also can you explain little further this problem?

Problem 2. The number of violent crimes committed in a day possesses a distribution with a mean of 2.8 crimes per day and a standard deviation of 4 crimes per day. A random sample of 100 days was observed, and the sample mean number of crimes for the sample was calculated. Which one of the following four possibilities describes the sampling distribution of the sample means: (5 points)

1. a.)shape unknown with mean of 2.8 and a standard deviation of 0.4
2. b.)approximately normal with mean of 2.8 and standard deviation of 4
3. c.)shape unknown with mean of 2.8 and standard deviation of 4
4. d.)approximately normal with mean of 2.8 and standard deviation of 0.4