How Can You Protect Your Computerized Medical Office Records Against

How can you protect your computerized medical office records against fires and computer viruses?

A) Do not open attachments from people you don't know.
B) Do not open email messages from people you don't know.
C) Make backup copies of all files nightly.
D) Store backup files off the premises.
E) Make backup copies of all files nightly AND store backup files off the premises.