True and False questions only please

18. Financial statement (ratio) analysis is complete and it does not have any limitations. 19. When you buy a call option, your profit rises as underlying stock rises, but your risk (loss) is limited to the premium you paid to buy the options contract. 20. P/E ratio indicates how much investors paid for one dollar of earnings. 21. An option contract is obligatory from the standpoint of an option writer. 22. Under constant growth DCF model growth rate can exceed the required return