Which of the following are true about WebSphere Commerce Payments cassettes？（）
- AThe site does not need a cassette， unless the site requires real-time credit card validation.
- BA cassette is a piece of plug-in software that provides support for a specific payment system.
- CThe CyberCash cassette is installed by default， with the installation of WebSphere Commerce Payments.
- DThird party companies can create custom cassettes that will work with WebSphere Commerce Payments.
- ECassettes convert the merchant payment request to the payment protocol of the local payment system.