Step 1: Wheat is a dryland cereal crop, so its land preparation and harvest use dry-tillage and cutting equipment.
Step 2: Disk harrow is used for primary tillage, shovel cultivator for inter-culture and weeding, and reaper for cutting the mature wheat crop at harvest. All three fit wheat cultivation.
Step 3: A puddler is used to churn and pulverize a wetland field into a soft muddy state, which is a paddy or rice field preparation practice, not something done for dryland wheat. So option 4 is correct.