A note's duration is indicated by A.Whether the stem is filled or not B.Whether the note head is filled or not and the number of stems on the flag C....

A note's duration is indicated by

A.Whether the stem is filled or not

B.Whether the note head is filled or not and the number of stems on the flag

C.Whether the note head is filled or not and the number of flags on the stem

D.The number of flags on the stem