Which of the following are true about WebSphere Commerce Payments cassettes？（）

• A、The site does not need a cassette， unless the site requires real-time credit card validation.
• B、A cassette is a piece of plug-in software that provides support for a specific payment system.
• C、The CyberCash cassette is installed by default， with the installation of WebSphere Commerce Payments.
• D、Third party companies can create custom cassettes that will work with WebSphere Commerce Payments.
• E、Cassettes convert the merchant payment request to the payment protocol of the local payment system.