How are a concurring opinion and a dissenting opinion on a Supreme Court case different?

A concurring opinion can be written by any Supreme Court justice; a dissenting opinion can only be written by the chief justice.

A) A concurring opinion is an oral statement given in the Supreme Court; a dissenting opinion is a written statement.
B) A concurring opinion is delivered before the Court's ruling is announced; a dissenting opinion is delivered after.
C) A concurring opinion agrees with the majority opinion; a dissenting opinion disagrees with it.