Which of the following is a feature of mobile payment solutions?

Mobile payment solutions are characterized by their integration of both hardware and software specifically designed to process transactions. This includes a combination of mobile devices, such as smartphones or tablets, equipped with apps or payment software that allow users to make payments easily and securely. This feature of combining device and software is fundamental to mobile payment systems, enabling transactions to occur anytime and anywhere, as long as the user has access to a mobile network.

The other options do not accurately describe mobile payment solutions. While a web-based interface is relevant to online transactions, it does not specifically characterize mobile payments, which focus more on the mobile platform. Similarly, while a broadband connection can enhance the user experience, mobile payments can often function on cellular networks rather than requiring a dedicated broadband connection. Lastly, mobile payment solutions do not operate solely on cash; they are specifically designed to facilitate digital payments, integrating various forms of payment methods such as credit/debit cards and digital wallets, rather than being limited to cash transactions.