What is a terrorist tactic?

using unexpected force to create alarm and a sense of danger

paying people to vote for a certain candidate

advertising on television and writing blogs about their good works

buying off political opponents

"Using unexpected force to create alarm and a sense of danger"

Explanation:

Terrorism is generally defined as "the unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims." This shows that the first answer is the best.