Which of the following is a method of execution?

The electric chair is recognized as a method of execution because it is one of the forms used in capital punishment to carry out the death penalty. Specifically, the electric chair involves delivering a lethal dose of electric current to the condemned individual, which results in death. Historically, various states in the U.S. have employed the electric chair as an alternative to methods like hanging or lethal injection.

In contrast, prison is a correctional facility for detaining individuals who have committed crimes, not a method of execution; probation is a form of supervised release that allows offenders to serve their sentence conditionally in the community instead of incarceration; and community service refers to an alternative punishment that involves performing work for the benefit of the community, typically assigned in minor offense cases. These alternatives do not involve execution in any way, making them distinctly different from the electric chair.