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

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:

$A$ ribozyme is ...

Ribose sugar is present in

How many main types of $RNA$ are there?

Describe in short about $RNA$.