A project network is shown below.

Activity	Precedence Activities	Optimistic Most Probable Pessimistic Time (weeks)
A	--	1 5 10
B	--	2 4 8
C	--	4 8 12
D	A, B	2 4 8
E	C	10 12 14
F	C	4 10 16
G	D, E	1 3 5
H	E	1 2 3
I	E, F	2 5 7

• What is the ES, EF, LS, and LF for activity G?

	A.	ES = 20, EF = 23, LS = 21, and LF = 24
	B.	ES = 20, EF = 23, LS = 21.83, and LF = 24.83
	C.	ES = 20, EF = 23, LS = 22, and LF = 25
	D.	ES = 19, EF = 23, LS = 21, and LF = 24.