Miles has owned a house in Honolulu, HI for 10 years. He and his wife, Shivani, have lived there together for six years. In 2023, Miles sells the house for 6,000,000. Miles originally paid 1,230,000. If Shivani and Miles file a joint return, what is their: (a) Realized gain? (b) Recognized gain? (c) What if, instead, Miles and Shivani have never lived together, but are married and file a joint return. What is their recognized gain?