If t is the duration of an activity, t₁ is the latest finish possible moment of its preceding activity and t₂ is the earliest start possible moment, the independent float of the activity is____.

A)
(t₁ - t₂) - t
B)
(t₁ + t₂) - t
C)
t + (t₁ - t₂)
D)
t - (t₁ - t₂)

Correct Answer :   (t₁ - t₂) - t