Financial freedom: refers to the state of income that does not require hard work for money. Generally, two conditions need to be met: maintaining cash inflows from property income, and maintaining a certain amount of net assets. Which of the following are financially free? ['Mr. Li has two houses with a total price of more than 3 million. The monthly rent is just enough to cover the bank mortgage. The daily expenses of the family are maintained by his own salary.', "Mr. Zhang, a company's boss, is preparing for debt management and expanding the company's production scale. He has applied for a mortgage loan from his bank with his real estate.", 'After Mr. Liu quit his job, he traveled throughout the country for many years, enjoyed the sights and historical sites, and easily paid all expenses with his bank deposit interest.', 'Mr. Wang, a fan of stocks, uses his own cash of more than two million yuan for stock speculation, and pays attention to the stock trend at any time. Every stop, the limit stop never misses the stop, never let it go.']