A partially solved PERT problem is detailed in the table below. Times are given in weeks.

Activity	Preceding	Optimistic Time	Probable Time	Pessimistic Time	Expected Time	Variance
A	--	7	9	14
B	A	2	2	8
C	A	8	12	16
D	--	3	5	10
E	C	4	6	8
F	B	6	8	10
G	F	2	3	4
H	D, E	2	2	8
I	G	6	8	16
J	H	4	6	14
K	I, J	2	2	5

Which activities form the critical path?