If a population is known to be normally distributed what can be said of the sample

If a population is known to be normally distributed, what can be said of the sampling distribution of the sample mean drawn from this population? A.) For any sample size n, the sampling distribution of the sample mean is normally distributed. B.) For a sample size n<50, the sampling distribution of the sample mean is normally distributed. C.) For a sample size n<30, the sampling distribution of the sample mean is normally distributed. D.) For a sample size n>30, the sampling distribution of the sample mean is normally distributed. E.) None of these.