What type of connection is primarily used for business WAN connections?

Leased lines are dedicated, point-to-point connections that are exclusively reserved for a customer's use, which makes them particularly suitable for business WAN connections. This type of connection provides a reliable, constant bandwidth and is not shared with other users, offering consistent performance and low latency, critical for enterprise applications such as VoIP, video conferencing, or large data transfers.

Businesses often require high availability and the ability to handle substantial data traffic securely, attributes that leased lines offer due to their private nature. They also come with Service Level Agreements (SLAs) that guarantee a certain level of performance and uptime, which is essential for maintaining business operations.

In comparison, while options like DSL and dial-up can be used for internet connectivity, they often do not provide the same level of reliability, speed, or dedicated service that businesses require. Local loop refers more to the physical connection from the service provider to the customer location and does not specifically indicate the type of service, making it less applicable for this context.