What is the definition of work in physics?

Work is only done when a force is applied to an object and it moves.
Work is done whenever a force is applied to an object, regardless of whether it moves or not.
Work is done when an object is lifted against gravity.
a) Only statement I is correct.
b) Only statement II is correct.
c) Only statement III is correct.
d) Statements I and III are correct.
e) Statements II and III are correct.