Which of the following is not a standard delivery frequency?

The option indicating "every third week" is not considered a standard delivery frequency in the context of Cintas services. Typical delivery schedules include weekly, bi-weekly (every second week), and monthly options because these frequencies align more closely with common business operations and customer needs for consistent service and supply replenishment.

Businesses often prefer predictable and easily manageable schedules such as weekly or bi-weekly deliveries, which help maintain inventory levels while minimizing disruptions to their operations. Monthly deliveries are also common, particularly for businesses that may not require as frequent restocking.

In contrast, an "every third week" delivery schedule is less typical and can create complications in inventory management and customer expectations, making it less viable in practice. This irregular frequency can lead to confusion or gaps in service, which is why it is generally not adopted in standard delivery practices.