Consider the following work breakdown structure: What is the probability that the project will be finished within 221 days?

		Time Estimates (days)
Activity	Precedes	Optimistic			Most Likely			Pessimistic
Start	A,B		-			-			-
A	C,D		44			50			56
B	D		45			60			75
C	E		42			45			48
D	F		31			40			49
E	F		27			36			39
F	End		58			70			82

		a.1.
		b.0.
		c.0.9.
		d.0.6.
		e.2.5.