The Legal Status of a County Sheriff Is Unique in Which

The legal status of a county sheriff is unique in which two ways?

A) The sheriff is appointed by the county board and serves only two years.
B) The sheriff is protected by a constitutional amendment which bans any civil litigation against his or her department; this amendment cannot be changed without a vote yielding a two-thirds majority ruling.
C) The sheriff is actually an elected state official and has local authority granted under the U.S. Constitution.
D) In most states, the office of sheriff is an elected position and is specified under the state constitution.