You analyze a medium-cap investment fund that has been in existence for 48 months. During this period, the fund achieved a sample standard deviation of monthly returns of 4.60% . You now want to test the claim that this particular investment fund result in a standard deviation of monthly returns of less than 5%. Using, which of the following represents the correct conclusion?

a) There is evidence that the fund result in a standard deviation of monthly returns of less than 5%

b) There is no evidence that that the standard deviation of the fund's monthly returns is less than 5%

c) There is no evidence that the standard deviation of the fund's monthly returns is higher than 5%

d) There is evidence that the standard deviation of the fund's monthly returns is higher than 5%