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The best description of an operational level Agreement（OLA）is（）。
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| A.
an agreement between the serivice provider and another part of the same Drganization
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| B.
an agreement between the serivice provider and an exterral organization
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| C.
a docament that describes how services will be operated on a day -to -day basis to customer
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| D.
a docament that business services to operational staff
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