Wich of the following is an example of double jeopardy

Begin sued for causing jack Smith death after being found not guilty of jack Smith death
Being tried for murder of jack Smith after being found not guilty for murdering jack Smith
Being tried for the murder of jack Smith after being found not guilty for murdering Joe Smith
Being tried for the murder of jack Smith after the first murder trial ended in a mistrial

Being tried for the murder of jack Smith after being found not guilty for murdering jack Smith is an example of double jeopardy.