Which of the following type of RNA is involved in splicing?

snRNA is involved in RNA splicing i.e removal of introns from hnRNA, regulation of transcription factors or RNA polymerase II and in the maintenance of telomeres. snRNA is a class of small RNA molecules that are found within the nucleus of eukaryotic cells. They are transcribed by RNA polymerase II or RNA polymerase III. Ref: Maternal, Fetal and Neonatal Physiology: A Clinical Perspective By Susan Tucker Blackburn, Page 5; Essentials of Pathophysiology: Concepts of Altered Health States By Carol Mattson Poh, Page 93