Bob tests the null hypothesis that the population mean is less than or equal t

Bob tests the null hypothesis that the population mean is less than or equal to 45. From population size of 3.000.000 people 81 observations are randomly
sampled. The corresponding sample mean is 46.3 and sample standard deviation is 4.5. What is the value of the appropriate test statistic for the test of
the population mean. And what is the correct decision at the 1 percent significance level?

a. z = 0.29. and fail to reject the null hypothesis

b. z = 2.60 and reject the null hypothesis

c. t = 0.29. and accept the null hypothesis

d. t = 2.60. and neither reject nor fail to reject the null hypothesis