Which of the following statement is true according to the Central Limit theorem? (a) Population's mean can be inferred from a sample's mean for any population. (b) Population's variance can be inferred from the sample's variance for any population. (c) Population's mean can be inferred from a sample's mean for any sample chosen at random. (d) Population's variance can be inferred from the sample's variance for any population provided that the size of sample is large and population data is normally distributed.