How to start up from the Recovery HD with FileVault 2 enabled

If a customer has FileVault 2 enabled on their drive, how do they start up from the Recovery HD?
A. Hold the Command and R keys at startup.
B. The customer must turn off disk encryption to use this feature.
C. Use the option key and choose the Recovery HD in the Startup Manager.
D. Attach a USB hard drive with OS X Lion installed on a non-encrypted disk and use the
Recovery HD on that drive.
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