Why Is TBP Referred to as a Universal Transcription Factor

Multiple Choice

Why is TBP referred to as a universal transcription factor?
(I) TBP is present in both prokaryotic and eukaryotic organisms.
(II) TBP catalyzes the initiation of all RNA polymersase in both prokaryotes and eukaryotes.
(III) TBP is required for initiation by RNAP I,RNAP II,and RNAP III.

A) I,II,III
B) I,II
C) I,III
D) II,III
E) III only