Which of these is true? Argonaute protein null mutants will be defective in translational inhibition but will be able to combat viruses O Only one of the siRNA strands is biologically active O Dicer mutants will lack all types of small RNAs, including long circular RNAs O Preventing transposon mRNA cleavage will have no effect on the heterochromatization of its genomic locus O If there is a mutation that renders AGO catalytically dead (it cannot cut RNA), adding extra Dicer protein would rescue the AGO mutant phenotypes, because Dicer also cuts mRNA.