Given below are four statements about viruses. Which of the following statement or statements is or are incorrect?

A

All known viruses contain RNA as the genetic material.

B

During viral multiplication, a complementary DNA is produced in riboviruses.

C

Viruses are the smallest, freely living cells found on the planet.

D

DNA containing viruses are more susceptible to mutations when compared to RNA containing viruses and hence show a very rapid evolution.