How can Supreme Court decisions be overturned?

a. All Supreme Court decisions can be overturned by new legislation.
b. All Supreme Court decisions can be overturned by a joint congressional and presidential decree to vacate the Supreme Court's decision.
c. Decisions made on statutory grounds can be overturned by new legislation; decisions based on constitutional grounds can be overturned by a constitutional amendment.
d. Decisions made on statutory grounds can be overturned by a constitutional amendment; decisions based on constitutional grounds can be overturned by new legislation.
e. Only the Supreme Court can overturn its decisions.

C