Which command should you run?

You install SQL Server Reporting Services (SSRS).
You need to restore a copy of the symmetric key.
Which command should you run?

A.
rskeymgmt -a -f %temp%\\rs.key -p Password1

B.
rskeymgmt -e -f %temp%\\rs.key -p Password1

C.
rskeymgmt i

D.
rskeymgmt d