Tax year 2023, please show work

Sarah and Ned, both age 47 , are married and jointly own their principal residence. They have owned and occupied the house for 10 years. They originally paid $460,000 for the house. In 2023 , they sell the house for $1,200,000. (a) What is Sarah and Ned's realized gain/loss, if any? (b) What is Sarah and Ned's recognized gain/loss, if any? (c) What is your answer to part (b) if everything in the problem is the same, except that Sarah is the sole owner of the house