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真题 （2022年上半年）
The best description of an operational level Agreement（OLA）is（）。
A
an agreement between the serivice provider and another part of the same Drganization
B
an agreement between the serivice provider and an exterral organization
C
a docament that describes how services will be operated on a day -to -day basis to customer
D
a docament that business services to operational staff
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