Given the following information, draw the precedence diagram. How many following tasks does Task B have? $($slides $25-28)$

Task Time$($sec$)$ Predecessor$($s$)$

A $30$ none

B $20,A$

C $10,$ B$,$ D

D $40,A$

E $30,$ B$,$ D

F $20,$ D

G $40,$ C$,$ E$,$ F

H $20$ G

$4$

$7$

$5$

$6$