Final answer:
Scheduled callbacks are categorized as 'Scheduled', non-scheduled callbacks as 'Non-Scheduled', and ACD voicemails as 'Voicemail' media type.
Step-by-step explanation:
ACD (Automatic Call Distribution) systems categorize media types based on different criteria. Scheduled callbacks refer to calls that are scheduled to be made at a specific time, while non-scheduled callbacks are calls made without a specific schedule. ACD voicemail refers to voicemail messages left by callers.In forecasts and schedules, scheduled callbacks are categorized as 'Scheduled' media type, non-scheduled callbacks are categorized as 'Non-Scheduled' media type, and ACD voicemails are categorized as the 'Voicemail' media type.Therefore, the correct answer is option d) Scheduled, non-scheduled, voicemail.