Which of the following statement(s) is/are correct for work done to be zero? I. If the displacem...

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Which of the following statement(s) is/are correct for work done to be zero?
I. If the displacement is zero.
II. If force applied is zero.
III. If force and displacement are mutually perpendicular to each other.
(a) Only I
(b) Both I and II
(c) Only II
(d) I, II and III
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