What is the critical path?

All sources must be referenced; paraphrased and quoted material must have accompanying citations.
1.    Using the figure below, answer the following questions:

a. What is the critical path?
b. What is the expected activity duration?
c. How much slack is available in the noncritical path?
d. Upon changing to a late-finish schedule, what would be the new duration?
e. Reconfigure the network as a critical chain network. What is the new duration of the project?
f. How long is the project buffer?
g. How long is the feeder buffer?

All times are calculated in days. (1 Page)