Transcription is a process by which

Removal of $RNA$ polymerase $I$ from nucleoplasm will affect the synthesis of

$RNA$ polymerase $II$ transcribes which type of $RNA$?

$RNA$ polymerase-$I$ transcribes eukaryotic ribosomal $RNA$ which does not consist of: (in $S$ $rRNA$)

$A$ : $RNA$ polymerase is of three types in eukaryotes for the synthesis of all types of $RNAs$.
$R$ : $RNA$ polymerase consists of six types of polypeptides along with rho factor which is involved in termination of $RNA$ synthesis.

Which form of $RNA$ is most heterogeneous?