单项选择题

A.FIELD Type := action B.SELECT Type = action C.SELECT ……

which one of the following statements would lee include in an agent to limit the documents processed by the agent to those for which the value of the type field is "action"? （）

A.FIELD Type :="action"
B.SELECT Type ="action"
C.SELECT Type :="action "
D.@if (type="action";@success;@failure)

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