Which of these is correct and why?

Step-by-step explanation:

Given is a statement with fill in the blanks and we are to fill up them suitably.

Recollect central limit theorem that states that the mean of all sample means will follow a normal distribution irrespective of the original distribution of the sample provided the samples are drawn at random and for large sample sizes.

Using that we can say that

A sampling distribution for a sample mean is made up of many __sample means calculated from many random samples from a population. The distribution is centered at the mean of sample mean . The standard deviation of all the Sample Means is called the Standard error. .