Using the CPM approach to Project Management, what is the critical path and completion time for the for following network diagram?

ACTIVITY	Precedent Activity	Completion Time
A	NONE	3
B	A	1
C	B	2
D	C	4
E	D	2
F	D	3
G	D	2
H	E, F	2
I	F, G	1
J	H, I	1

		A-B-C-D-E-H-J = 15 weeks
		A-B-C-D-F-I-J = 15 weeks
		A-B-C-D-F-H-J = 16 weeks
		A-B-C-D-G-I-J = 14 weeks