What action must a voter take if their registration information is missing?

When a voter's registration information is missing, the appropriate action is to vote provisionally after completing an affirmation statement. This is crucial because provisional ballots are designed to ensure that individuals who believe they are eligible to vote can still participate in the election process while confirming their registration status.

The provisional ballot allows the election officials to verify the voter's eligibility against the registration records. Once the voter's information is confirmed, their vote is counted. This process protects the integrity of the election while also ensuring that eligible voters do not miss out on the opportunity to have their voices heard.

The other options do not provide the necessary steps to ensure that the voter can participate in the election effectively in the situation where their registration information is not found. For instance, voting by regular ballot would not be possible if the registration is indeed missing, as there would be no record of the voter in the system. Contacting a state official for clarification could be beneficial, but it does not guarantee participation in that election. Resubmitting voter registration may also not be feasible at that moment and doesn't address the immediate need to vote on election day. Thus, voting provisionally is the correct and most immediate course of action to ensure that the voter's intent is honored.