When did Jack realize Hurley was meant to be the Protector of the island? (poll 3698340)

When did Jack realize Hurley was meant to be the Protector of the island?

When Jacob explained the job - Jack only volunteered because Hurley didn't

Jacob told him in an unseen conversation before or after the cup ceremony

While trekking to The Heart and considering he might die protecting it

After he self-diagnosed his wound from The Man in Black as fatal

When Kate and Sawyer left and Hurley and Ben stayed behind with him

During the hike back to The Heart while Hurley helped him walk

Right in front of us, at the moment he told Hurley

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