To impeach someone is to bring official charges against a public/government official. It's most often seen with Presidents. For example, in America, the Presidents that were impeached include Andrew Johnson and Bill Gates. Both of them violated the promise they made when they became President because they took advantage of their power.
B, this happens when an official (such as the president) has committed a felony in office. He is brought down from his status then officially tried in a court of law
In Miranda v. Arizona, the Supreme Court ruled that detained criminal suspects, prior to police questioning, must be informed of their constitutional right to an attorney and against self-incrimination.