SHARK JUMP

When did LOST "jump the shark?"

For those who liked The Ending, the answer is never.
For those who disliked The Ending, the answer could be unclear.

For the casual viewer who got pulled into the hype of the first season, but
never was a die hard fan, the shark jumping moment could be:

A) when the smoke monster appeared;
B) when the Others appeared;
C) when the Tail Sections survivors were introduced;
D) when time travel was introduced;
E) when the Hatch imploded but Desmond survived;
F) when the fake wreckage site was found;
G) when Jack screamed "we have to go back!"
H) when the Jacob and Man in Black story arc came into full view.