Consider the following four statements (a-6) and H._ select the option which includes all the correct ones only:-
(a) Ribosomes are the granular structure first observed by George Palade.
(b) Both the centrioles in a centrosome lie perpendicular to each other.
(c) A single human cell has approximately 2.2 meter long thread of DNA distributed in one chromosomes.
(d) Material of the nucleus (chromatin) stained by the only acidic dyes.