【多选题】
A <{p}>A backup set may be duplexed with both copies
written to disk.<{br/}><{/p}>
B <{p}>An image copy on disk can be copied to disk<{br/}><{/p}>
C <{p}>A backup set may be duplexed with both copies
written to sbt<{br/}><{/p}>
D <{p}>A backup set may be duplexed so that one copy is
written to sbt and the other to disk.<{br/}><{/p}>
E <{p}>An image copy on disk can be copied to sbt.<{br/}><{/p}>
F <{p}>An image copy on sbt can be copied to disk.<{br/}><{/p}>
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