What Are CRISPR RNAs

What are CRISPR RNAs?

A) Small RNAs associated with nucleases that cut DNA at defined sites
B) Large RNAs found in eukaryotes that inhibit gene expression at specific locations
C) Small RNAs that are often used as primers in PCR experiments
D) Large RNAs found in eukaryotes that prevent infection by certain viruses that have a RNA genome
E) Small RNAs found in eukaryotes that are complementary to highly repeated DNA sequences