Chromatids are strands that have the genetic information in a replicated chromosome. In other words, they are the strands that form the chromosome that will later separate in the anaphase. Chromatids have a short arm and a long arm, telomeres, are nucleotide sequences at the end of the chromatids, and the centromere, which holds the two sister chromatids together.
If this division is based on tissue formation then it is correct because there are 8 types of cells. If it's based on the function then it's incorrect because there are more than 10.