Which of the following is true? PLEASE TICK ALL THE ONES THAT ARE TRUE. a. Let Mt be a martingale or submartingale with left continuous paths. Then P(supstMs>a)aEMt. b. Processes of bounded variation have zero quadration variation. c. Every square integrable martingale adapted to the Brownian motion filtration is continuous. d. Most continuous martingales arise from Brownian motion via a time change. e. Brownian motion is not Holder continuous of order