If E is the duration, ES and EF are die earliest start and finish times, LS and LF are latest start and finish times, then the following relation holds good

If E is the duration, ES and EF are die earliest start and finish time

1.	If E is the duration, ES and EF are die earliest start and finish times, LS and LF are latest start and finish times, then the following relation holds good
A.	EF=ES+D
B.	LS=LF-D
C.	LF = LS + D
D.	all of the above.
Answer» E.