Sharon Recently Lost an Encryption Certificate That Rendered Some of Her

Sharon recently lost an encryption certificate that rendered some of her EFS-encrypted files unrecoverable. To prevent a similar situation from arising in the future, she wants to create a recovery certificate for recently encrypted files. She creates the recovery certificate.
What should Sharon do next?

A) Run cipher with the /r:filename option, where filename is the name of the recovery certificate
B) Use the public key of the recovery certificate to encrypt the symmetric key
C) Run cipher with the /u option to update the existing encrypted files
D) Import the recovery certificate into the local security policy as a data recovery agent