How many polynucleotide chains are present in $RNA$?

Which of the following is non-genetic and is utilized for protein synthesis?

$RNA$ contains:

Given below are two statements:
Statement $I$: Catalytic RNAs are called ribozymes.
Statement $II$: $RNA$ can undergo mutations,replicate,and catalyse reactions.
In the light of the above statements,select the correct option given below:

In-vitro template-independent $RNA$ synthesis is a feature of

How many main types of $RNA$ are there?