Which sets of curved arrows accounts for the protonation of propene with HI?

Name: Which sets of curved arrows accounts for the protonation of propene with HI?
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Question

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Set 1 shows the initial approach of HI to the pi bond of propene, forming a resonance-stabilized carbocation intermediate. Set 2 shows the transfer of a proton from the HI to the carbocation intermediate, resulting in the formation of the final protonated product. Sets 3 and 4 do not accurately depict the protonation mechanism.

Which Sets of Curved Arrows Accounts for the Protonation of Propene