THIS IS A 4-PARTER!!!! Name the feature at the “X” [feature]…

THIS IS A 4-PARTER!!!! Name the feature at the “X” , its bone , and indicate if you are more likely to hear the… …aortic  /  bicuspid  /  pulmonic  /  tricuspid  valve at the arrow-tip, and if that is a… …atrioventricular  /  semilunar  type of valve.  Don’t forget the doppler effect!