A company must perform a maintenance project consisting of seven activities. The activities, their predecessors, and their respective time estimates are presented below:

Immediate

Activity

Designation

Predecessor

Time in Days

Break down both machines

A

None

3

Clean machine 1

B

A

3

Clean machine 2

C

A

3

Re-set machine 1

D

B

1

Re-set machine 2

E

C

2

Re-calibrate both machines

F

D and E

1

Final test

G

F

2

Using the Single Time Estimate CPM procedure, what is the critical path for the project & the overall project duration?

e. ABCDG & 10 days

c. ABDFG & 10 days

d. ABDFG & 11 days

b. ACEFG & 10 days

a. ACEFG & 11 days