Final answer:
Option D is the correct statement. 75 percent of the cases created by the customer must be created using email, while the remaining cases may be created with any other channel.
Step-by-step explanation:
Option D is the correct statement. When the entitlement is created, 75 percent of the allocation is assigned to email. This means that 75 percent of the cases created by the customer must be created using email, while the remaining 25 percent of the cases may be created using any other channel. The customer has flexibility in choosing the channel for the remaining cases.