An email from a supplier reads: 'Due to increased demand, we regret to inform you that the delivery of your order #4521 has been delayed by one week. We apologize for any inconvenience caused.' What is the main purpose of this email?
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A
To notify the recipient of a delivery delay
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B
To confirm successful delivery of an order
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C
To request payment for an outstanding invoice
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D
To cancel an order due to stock unavailability