What is the most secure way to mitigate the theft of corporate information from a laptop that was left in a hotel room?

What is the most secure way to mitigate the theft of corporate information from a laptop that was
left in a hotel room?

A.
Set a BIOS password.

B.
Encrypt the data on the hard drive.

C.
Use a strong logon password to the operating system.

D.
Back up everything on the laptop and store the backup in a safe place.