A 14 year old presents to the clinic for a sports physical. On exam a Grade 2/6 soft, non-harsh murmur is noted. The other feature(s) of this murmur which should be documented (if identified) include which of the following?:

a. Is this an S1 or S2 murmur
b. Located at left sternal border
c. splitting of S2 disappears during expiration and or sitting up
d. all of the above