John purchased a home in 2010. Through your interview process, you discover that he sold the home in 2021. John had not lived in the home for six years. Which of the following conditions would allow John to exclude his gain?

	John went on sabbatical for four years and backpacked through Europe.
	John lived with a co-worker for four years and let his brother occupy his home.
	John was deployed to Europe on official extended military duty for five years.
	John married and his bride had her own home. The couple chose to live in the wife's home and rent out John's home, until it was sold.