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What is true about a background engine? （）(Choose two.)
A:It is a server-side PL/SQL procedure.
B:When executing a PL/SQL function activity, it will automatically ping (cache) the PL/SQL code.
C:It executes deferred activities in decreasing order of their Cost property value (activities with higher cost value are processed first).
D:It would fail if another background engine process is started to handle the same type of activities within the same item type.
E:During its single invocation, it processes activities that were stuck, deferred or timed out when the background engine was started.

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出自：Oracle认证

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