A force acts during the $1.8$ s interval that begins $0.7$ s after an experiment starts. What are the correct integration limits?

$t_1=0$ s, $t_2=1.8s$

$t_1=0.7$ s, $t_2=2.5$ s

$t_1=1.8$ s, $t_2=2.5$ s

$t_1=0.7$ s, $t_2=1.8$ s