Which statement about SOAP is not true?

SOAP (Simple Object Access Protocol) is a protocol used for exchanging structured information in web services. The choice stating that SOAP is "extremely fast" is not true because, while SOAP can be efficient, it often has overhead due to its reliance on XML. XML is verbose, and the additional layers that SOAP includes for things like error handling, security, and built-in compliance with standards can lead to slower performance compared to other protocols such as REST, which typically uses lighter-weight formats like JSON.

In contrast, the other statements about SOAP are factual. It indeed works over numerous protocols, including HTTP, SMTP, TCP, and more, which gives it flexibility in different environments. Additionally, SOAP is standards-based, adhering to specifications defined by various organizations. This adherence to standards is a foundational characteristic of SOAP, contributing to its use in enterprise-level applications that require high levels of interoperability. Finally, SOAP is highly reliant on XML for message formatting, integrating XML's features to define the structure, encoding, and processing rules of messages.