A 72-year-old man with diabetes and stage 4 CKD asks about pneumococcal vaccination. He has never received a pneumococcal vaccine. According to recent NACI guidance, which is the preferred option for adult pneumococcal immunisation in this context?AOne dose of Pneu-P-23 onlyBSequential Pneu-C-13 then Pneu-P-23 separated by 8 weeksCSingle dose of Pneu-C-20 conjugate vaccineDNo vaccination is indicated after age 70EAnnual pneumococcal vaccination with any available productCheck my answer