How can you remove the Privileged Exec password from the router?

How can you remove the Privileged Exec password from the router?

A.
Configure erase secret 60 then push the top button on the SRP.

B.
Configure erase secret 300 then push the top button on the SRP.

C.
Configure erase secret 60 then push the bottom button on the SRP.

D.
Configure erase secret 300 then push the bottom button on the SRP.