How many different types of RNA polymerases are involved in synthesis of all rRNA of 80S ribosome?

80 S - 40% r-RNA + 60% proteins
60 S - r-RNA 28 S, 5.8 S, 5 S
40 S - r-RNA 18 S
The RNA polymerase I transcribes rRNAs (28S, 18S, and 5.8S), whereas the RNA polymerase III is responsible for transcription of tRNA, 5srRNA, and snRNAs (small nuclear RNAs).