Final answer:
Online voting, as it is not a standard option in state or federal elections today, while absentee voting, early voting, and in-person voting are established methods. The correct answer is D.
Step-by-step explanation:
Among the types of voting currently allowed in state or federal elections today, online voting is not a standard option. While some regions have experimented with online voting, it remains in experimental stages due to concerns about security and voter fraud. Therefore, the correct answer to which of the following is not a type of voting allowed in state or federal elections today is D. Online voting.
The established methods of voting include absentee voting, where ballots are mailed to voters who request them; early voting, allowing voters to cast ballots in person before Election Day without needing an excuse; and in-person voting, which is the traditional method of voting on Election Day at local precincts or voting centers.