What could prevent a customer from ordering video-on-demand (VOD)?

The ability to order video-on-demand (VOD) services often relies on certain account-related conditions within the provider's system. When a customer reaches their VOD or pay-per-view (PPV) credit limit, they are prevented from making additional purchases until the limit is refreshed or increased. This is especially relevant for providers who set spending caps to manage billing and potential customer disputes. Hence, if the credit limit is reached, the customer cannot proceed with ordering VOD, making it a critical factor in the purchasing process.

Other factors such as internet speed, a faulty set-top box, or an expired subscription plan may also hinder a customer's experience with VOD, but they operate differently. Insufficient internet speed could lead to buffering or streaming issues, but it doesn't prevent the order itself. A faulty set-top box would impact the use of services rather than the ability to place an order. Similarly, an expired subscription plan would prevent access to the service altogether but doesn't specifically impact credit limits related to VOD usage. Thus, reaching credit limits is the most pertinent reason among the options listed that directly affects a customer's ability to order video-on-demand services.