A project network has the following activity details

Activities Predecessors Duration $($Weeks$)$

A $-6$

B A $4$

C A $3$

D B$,$ C $2$

E B$,$ C $5$

F D$,$ E $4$

G F $4$

What is the project duration for this example?

Group of answer choices

$19$ weeks

$26$ weeks

$28$ weeks

$23$ weeks