Which of the following layer in web services stack is vulnerable to fault code leaks?

The evolution of web services and their increasing use in business offers new attack vectors in an
application framework. Web services are based on XML protocols such as web Services Definition
Language (WSDL) for describing the connection points, Universal Description, Discovery, and
Integration (UDDI) for the description and discovery of Web services and Simple Object Access
Protocol (SOAP) for communication between Web services that are vulnerable to various web
application threats. Which of the following layer in web services stack is vulnerable to fault code
leaks?

A.
Presentation Layer

B.
Security Layer

C.
Discovery Layer

D.
Access Layer