For Check-in 21.2, how comes D rejects <D>1000000 on Step 1?On input w, mark off f(n) tape cells where n = |<D>1000000|. Then what happens?####[['D rejects <D>1000000', 'Mathematical_Related_Concept', 'NEU'], ['w', 'Mathematical_Related_Concept', 'NEU'], ['f(n)', 'Mathematical_Related_Concept', 'NEU'], ['n = |<D>1000000|', 'Mathematical_Related_Concept', 'NEU']]