Which command should you run?

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

A.
rskeymgmt i

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

C.
rskeymgmt -d

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