Given the following task time estimates (HOURS),

Task	Time	Predecessor
A	40
B	20
C	25	A
D	19	A, B
E	25	C, D
F	24	E
G	18	F

a. How long is the project length? [ Select ] ["134.83", "122.00", "127.45", "135.78", "132.00"] .

b. What tasks form the critical path? [ Select ] ["B, C, D, E, F, G", "A, B, C, E, F, G", "B, D, E, F, G", "A, D, E, F, G", "A, C, E, F, G"]

c. What is the LS/LF for activity D.? [ Select ] ["65 and 90", "44 and 55", "34.56 and 4.78", "50.19 and 7.08", "46 and 65"] .

d. How much slack is there in activity C? [ Select ] ["8.34 hours", "29 hours", "6 hours", "0", "12 hours"] How much slack in activity D? [ Select ] ["5 hours", "26 hours", "0, it is on the critical path", "28 hours", "6 hours"]

e. What if activity D. was delayed by 6 hours, what would be the project length and critical path? [ Select ] ["133 hours; A, C, E, F, G", "132 hours; B, C, D, E, F, G", "132 hours; A, C, D, E, F, G", "130 hours; B, C, E, F, F", "no change in either the critical path or project length"]

f. Referring to letter e., how much slack would be in activity B.? [ Select ] ["8 hours", "26 hours", "0 (zero), it is now on the critical path", "6 hours", "20 hours"]

Please provide in depth explanation as dumb down as possible. Thank you.