Which of the following is not a type of RNA processing?

• A. Polyadenylation at the 3‚Äö√Ñ√∂‚àö√ë‚àö¬• end
• B. Capping of 5‚Äö√Ñ√∂‚àö√ë‚àö¬• end
• C. Removal of exons
• D. Splicing