You are determining business rules for a new system. Determine if each scenario is a valid business rule.

Each customer must have a first and last name entered.

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We need to increase production.

Every invoice must reference a customer record.

Start date can't be before the end date.

The average production should be increased in November.

We only ship plants to Nevada, Oregon and Washington.

Quarterly earnings must increase.

Each vendor must supply at least one product.

An order is only associated with one customer.

All order items in an order are delivered at the same time.

Length of calls at a call center must decrease.