Which fields on service appointments help ensure that they are completed within the agreed upon service level agreement (SLA) with universal containers customers?

Which fields on service appointments help ensure that they are completed within the agreed upon service level agreement (SLA) with universal containers customers?
A . Scheduled start, scheduled end
B . Actual start, actual end
C . Earliest start permitted, due date
D . Arrival window start, arrival window end

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Answer: C