What is the full form of $RNA$?

The discovery of which of the following in $1980$ led to the term '$RNA$ World' for evolution?

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:

Select an incorrect statement regarding $\text{RNA}$ molecules.

Splicing represents the dominance of which world?

Sugar found in $RNA$.