A 27-year-old patient presented with left-sided abdominal pain to the emergency room 6 hours after a road traffic accident. He was haemodynamically stable and FAST positive. A contrast-enhanced CT (CECT) scan showed a grade III splenic laceration. (a) With no contrast blush, what is the most appropriate treatment? (b) If the same CECT instead shows a contrast blush along with the grade III laceration, what is the most appropriate management? (Choose the answer for part b.)