An iolab device is moving with constant speed in a straight line. according to newton's laws of motion, which of these statements can be true?
i. no force is acting.
ii. only one nonzero force is acting.
iii. two nonzero forces are acting.
iv. three nonzero forces are acting.

select one:
(a) only i
(b) only i and ii
(c) only ii and iii
(d) only i, iii and iv
(e) only ii, iii and iv